Research activity information

• Jul. 2018 37th JSST Annual International Conference on Simulation Technology, Student Poster Presentation Award, The Particle-In-Cell Simulation on LEO Spacecraft Charging and the Wake Structure using EMSES

  Nizam Ahmad, Hideyuki Usui, Yohei Miyake

  International society


• Oct. 2017 The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS), Obayashi Early Career Scientist Award, Study of satellite plasma environment using plasma particle simulation

  MIYAKE YOHEI

  Japan society


• 2005 Union Radio-Scientifique Internationale, URSI Young Scientist Award, Analysis of Receiving Antenna Characteristics in Space Plasma Environment via Particle-In-Cell Simulation

  Yohei Miyake

  International society

• 将来の月周回・月面観測および開発における 帯電環境計測と評価に向けて

  三好 由純, 三宅 洋平, 原田 裕己, 西野 真木, 栗田 怜, 笠原 慧, 臼井 英之, 永松 愛子, 奥村 哲平, 豊田 和弘, 中村 紗都子

  宇宙空間には宇宙放射線として知られる高エネルギー荷電粒子が存在し，これらは銀河宇宙線，太陽由来の高エネルギー粒子，地球磁気圏の荷電粒子から成る．地球とは異なり，大気や磁場を持たない月は，これらの宇宙放射線に直接さらされるため，月面活動では宇宙放射線の影響を深く理解し対策を立てることが重要である．具体的には，宇宙放射線による宇宙飛行士の健康や電子機器への悪影響，レゴリス帯電による問題などが挙げられる．本論文では，これに対する理解，そして評価と予測を進めるための今後の観測やシミュレーション，月宇宙天気研究の方向性とともに，具体的な対策のロードマップを議論する．

  日本惑星科学会, Mar. 2025, 遊・星・人, 34(1) (1), 27 - 42, Japanese, Domestic magazine

  [Refereed]

  Scientific journal


• Size-Dependent Surface Charging of Lunar Cavities exposed to the Solar Wind

  Jin Nakazono, Yohei Miyake

  Last, Feb. 2025, Journal of Geophysical Research: Space Physics, 130(2) (2), e2024JA033490, English, International magazine

  [Refereed]

  Scientific journal


• Collected Current by a Double Langmuir Probe Setup With Plasma Flow

  Chun-Sung Jao, Wojciech J. Miloch, Yohei Miyake

  Last, Institute of Electrical and Electronics Engineers (IEEE), Dec. 2024, IEEE Transactions on Plasma Science, 52(10) (10), 5222 - 5233, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Micro-scale Electrostatic Structures formed on the Rough Surfaces of the Moon

  Y. Miyake, J. Nakazono, Y. Miyoshi, Y. Harada, M. N. Nishino, S. Kurita, S. Kasahara, H. Usui, A. Nagamatsu, S. Nakamura

  Oct. 2024, arXiv:physics, 2410.05913, English, International magazine

  Research society


• Impedance of electric field sensors in magnetized plasmas: particle-in-cell simulations

  Ibuki Fukasawa, Yohei Miyake, Hideyuki Usui, Koshiro Kusachi, Satoshi Kurita, Hirotsugu Kojima

  Abstract To obtain both the intensities and phases of electric fields, it is necessary to calibrate the data observed by the sensor by consulting the sensor characteristics. The frequency profile of the sensor impedance obtained from the simulation is roughly consistent with that obtained from the theory. However, some differences are identified in the frequency profile of the sensor impedance obtained from the simulation compared to the theory. We conducted simulations using the particle-in-cell (PIC) simulation tool to analyze the impedance of electric field sensors immersed in magnetized space plasmas. The simulation model comprised a dipole sensor placed in a three-dimensional simulation box filled with electrons and ions. The dipole sensor was represented by perfect conductor rods. We carefully selected simulation parameters and employed an appropriate feeding technique to accurately evaluate the sensor impedance. We observed significant changes in the frequency dependence of the sensor impedance as cyclotron frequency varied. To understand the simulation results, we introduced the linear dispersion relation. By comparing the real part of the sensor impedance with the $$\omega-k$$ diagram, we found that the impedance peaks corresponded to frequencies at which branches of plasma waves were present, with $$k=k_{\text{half } }$$, representing half the wavelength equal to the tip-to-tip sensor length, i.e., the sensor can be assumed as the half-wavelength dipole antenna. Graphical Abstract

  Springer Science and Business Media LLC, Mar. 2024, Earth, Planets and Space, 76(1) (1), English, International magazine

  [Refereed]

  Scientific journal


• Spherical Langmuir probes in magnetized plasma. A model based on particle-in-cell simulations

  S. M. Brask, R. Mishra, G. Holen, Y. Miyake, H. Usui, W. J. Miloch

  We present a new model for current collected by a spherical Langmuir probe in magnetized plasmas. Data are obtained using state-of-the-art fully 3D kinetic particle-in-cell simulations. We perform a dimensional analysis and use it to determine the appropriate model function. The model is then empirically derived based on the simulation data for a range of probe potentials and magnetic field values with respect to the Debye length. The final model function is applicable to most space plasmas and can easily be generalized.

  AIP Publishing, Feb. 2024, Physics of Plasmas, 31(2) (2), English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Spacecraft Charging Simulations of Probe B1 of Comet Interceptor during the Cometary Flyby

  S. Bergman, Y. Miyake, S. Kasahara, F. L. Johansson, P. Henri

  Dec. 2023, The Astrophysical Journal, 959, 138, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Spacecraft Charging of the Morazán MRZ-SAT Satellite in Low Earth Orbit: Initial Results on the Influence of Energetic Electron Anisotropy on Differential Charging

  Raphael Bertrand-Delgado, Ravindra Desai, Fernando Zorto-Aguilera, Zeqi Zhang, Yohei Miyake

  Oct. 2023, Proceedings of 74th International Astronautical Congress (IAC), IAC-23-B4.IP.6, English, International magazine, Co-authored internationally

  [Refereed]

  International conference proceedings


• A plasma irradiation system optimized for space weathering of solar system bodies

  Tomoki Kimura, Misako Otsuki, Tomohiro Kitano, Ryo Hoshino, Yusuke Nakauchi, Shunsuke Haganuma, Ryu Haganuma, Tetsuo Haganuma, Fuminori Tsuchiya, Toru Tamagawa, Asami Hayato, Jun Kimura, Naoki Terada, Hideyuki Usui, Masaki N. Nishino, Shoichiro Yokota, Yohei Miyake

  Abstract In the tenuous atmospheric bodies of our solar system, space weathering on the celestial surface is an important process for its chemical and physical evolution and ambient environment on timescales of celestial evolution. Space plasma is a dominant energy and material source for space weathering. Plasma irradiation experiment in the laboratory is an effective method for modeling space weathering driven by space plasma. However, comprehensive modeling of plasma space weathering has not yet been conducted because the capabilities of the earlier facilities were not optimized for realistic space weathering; for example, the incident electron and ion were not irradiated in the same condition. Here, we developed a plasma irradiation system, Plasma Irradiation Emulator for Celestial Environments (PIECE) of the solar system bodies, which reproduces plasma space weathering in tenuous atmospheric bodies by the electron and ion irradiations in the same condition. We successfully developed a system with high electron and ion number fluxes of $$\sim 10^{13} - 10^{16} {\text{ particles cm } }^{ { - {2 } } } {\text{s } }^{ { - {1 } } }$$ at any acceleration energy in the range of 1–30 keV, which leads to a fluence of e.g., $$\sim 10^{18} - 10^{21} {\text{ particles cm } }^{ { - {2 } } } {\text{s } }^{ { - {1 } } }$$, with a 1-day irradiation time. This fluence corresponds to a plasma irradiation time of ~ 10³–10⁶ years on Europa. Graphical Abstract

  Springer Science and Business Media LLC, Sep. 2023, Earth, Planets and Space, 75(1) (1), 150, English, International magazine

  [Refereed]

  Scientific journal


• Modeling photoelectron and Auger electron emission from the sunlit lunar surface: A comparison with ARTEMIS observations

  Masahisa Kato, Yuki Harada, Shaosui Xu, Andrew R. Poppe, Jasper S. Halekas, Yohei Miyake, Hideyuki Usui, Masaki N. Nishino, Toru Matsumoto

  Abstract Due to the lack of a dense atmosphere, the Moon directly interacts with ambient plasmas and solar radiation, leading to lunar surface charging. Solar X‐rays drive the emission of photoelectrons and Auger electrons from the lunar surface to space. The Auger electrons have characteristic energies intrinsic to the photo‐emitting atoms and were recently identified at the Moon by Acceleration, Reconnection, Turbulence, and Electrodynamics of the Moon’s Interaction with the Sun (ARTEMIS) observations. In this study, we developed a numerical model of the energy spectrum of lunar photoelectrons and Auger electrons, thereby comparing the predicted and observed energy spectra. By adjusting a scaling factor, the model well reproduces the ARTEMIS observations obtained in the solar wind, where the energy spectra are minimally affected by surface charging. Meanwhile, the energy spectra obtained in the geomagnetic tail can be significantly altered by lunar surface potentials. We show that it is difficult to determine a unique combination of the scaling factor and the lunar surface potential with the ARTEMIS energy resolution because of a strong parameter degeneracy. Nevertheless, for a fixed scaling factor, a strong correlation is identified between the lunar surface potentials inferred from the shifts of the energy spectra and those from the upward photoelectron beam energies, providing a proof of concept for the use of the photo‐emitted electrons as a new remote sensing tool of the lunar surface potential. We advocate for future observations of lunar electrons with a high energy resolution. This article is protected by copyright. All rights reserved.

  American Geophysical Union (AGU), Sep. 2023, Journal of Geophysical Research: Space Physics, 128(10) (10), e2023JA031707, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Cassini’s floating potential in Titan’s ionosphere: 3-D Particle-In-Cell Simulations

  Zeqi Zhang, Ravindra Desai, Oleg Shebanits, Yohei Miyake, Hide Usui

  IEEE, Aug. 2023, 2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 1 - 4, English, International magazine, Co-authored internationally

  [Refereed]

  International conference proceedings


• Particle Simulations of Radio Wave Scattering by Small Objects covered with a Charged Particle Layer

  Yohei Miyake, Junya Takagi

  J-stage, Jun. 2023, Journal of Evolving Space Activities, 1, 50:1 - 7, English, Domestic magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Implementation of Coupled Numerical Analysis of Magnetospheric Dynamics and Spacecraft Charging Phenomena via Code-To-Code Adapter (CoToCoA) Framework

  Yohei Miyake, Youhei Sunada, Yuito Tanaka, Kazuya Nakazawa, Takeshi Nanri, Keiichiro Fukazawa, Yuto Katoh

  Jun. 2023, Computational Science – ICCS 2023. ICCS 2023. Lecture Notes in Computer Science, 14074, 438 - 452, English, International magazine

  [Refereed]

  International conference proceedings


• Simulating Secondary Electron and Ion Emission from the Cassini Spacecraft in Saturn’s Ionosphere

  Z. Zhang, R. T. Desai, O. Shebanits, F. L. Johansson, Y. Miyake, H. Usui

  Abstract The Cassini spacecraft’s Grand Finale flybys through Saturn’s ionosphere provided unprecedented insight into the composition and dynamics of the gas giant’s upper atmosphere and a novel and complex spacecraft–plasma interaction. In this article, we further study Cassini’s interaction with Saturn’s ionosphere using three-dimensional particle-in-cell simulations. We focus on how electrons and ions, emitted from spacecraft surfaces due to the high-velocity impact of atmospheric water molecules, could have affected the spacecraft potential and low-energy plasma measurements. The simulations show emitted electrons extend upstream along the magnetic field, and for sufficiently high emission rates, charge the spacecraft to positive potentials. The lack of accurate emission rates and characteristics, however, makes differentiation between the prominence of secondary electron emission and ionospheric charged dust populations, which induce similar charging effects, difficult for Cassini. These results provide further context for Cassini’s final measurements and highlight the need for future laboratory studies to support high-velocity flyby missions through planetary and cometary ionospheres.

  American Astronomical Society, Jun. 2023, The Planetary Science Journal, 4(6) (6), 105 - 105, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• 全方向に走査可能な３次元フェイズド・アレイ・アンテナの開発Ⅱ

  賀谷信幸, 三宅洋平, 仁田功一

  Feb. 2023, 信学技報, 122(401) (401), 118 - 123, Japanese

  [Invited]

  Symposium


• Unconventional Surface Charging within Deep Cavities on Airless Planetary Bodies: Particle‐in‐Cell Plasma Simulations

  J. Nakazono, Y. Miyake

  Kinetic plasma simulations suggest that unconventional surface electrical charging conditions develop within deep cavities on the Moon and other airless planetary bodies, which are directly impacted by the solar wind. Due to their aligned directions of motion, ions are more likely to reach the innermost part of such deep cavities than thermal electrons without being lost at the cavity sidewall. The ion current at the bottom of a cavity with a high depth-width aspect ratio tends to exceed the electron current. This generates a significant positive potential, similar in magnitude to the kinetic energy of solar wind ions and independent of the work done by photoelectron emissions. This positive charging process, primarily due to solar wind ions, is localized at depths in the cavities and may result in strong electric fields on the dayside of the Moon and asteroids.

  Last, Wiley, Jan. 2023, Journal of Geophysical Research: Planets, 128(2) (2), e2022JE007589, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Particle-in-Cell Simulations on Interferometry Technique by a Single Spacecraft

  Ibuki Fukasawa, Yohei Miyake, Hideyuki Usui, Koshiro Kusachi, Satoshi Kurita, Hirotsugu Kojima

  International Union of Radio Science (URSI), 2023, URSI Radio Science Letters, 4, English

  [Refereed]

  Scientific journal


• Simulation Study on Radio Wave Scattering by Small Objects covered with a Charged Particle Layer

  Yohei Miyake, Junya Takagi, Nobuyuki Kaya

  Mar. 2022, Proceedings - 33rd International Symposium on Space Technology and Science, English

  [Refereed]

  International conference proceedings


• Cross-Reference Simulation by Code-To-Code Adapter (CoToCoA) Library for the Study of Multi-Scale Physics in Planetary Magnetospheres

  Yuto Katoh, Keiichiro Fukazawa, Takeshi Nanri, Yohei Miyake

  IEEE, Nov. 2021, Proceedings - 2021 Ninth International Symposium on Computing and Networking Workshops (CANDARW), 223 - 226, English

  [Refereed]

  International conference proceedings


• Particle-in-cell simulations of the Cassini spacecraft’s interaction with Saturn’s ionosphere during the Grand Finale

  Zeqi Zhang, Ravindra T Desai, Yohei Miyake, Hideyuki Usui, Oleg Shebanits

  A surprising and unexpected phenomenon observed during Cassini’s Grand Finale was the spacecraft charging to positive potentials in Saturn’s ionosphere. Here, the ionospheric plasma was depleted of free electrons with negatively charged ions and dust accumulating up to over 95 per cent of the negative charge density. To further understand the spacecraft–plasma interaction, we perform a three-dimensional Particle-In-Cell study of a model Cassini spacecraft immersed in plasma representative of Saturn’s ionosphere. The simulations reveal complex interaction features such as electron wings and a highly structured wake containing spacecraft-scale vortices. The results show how a large negative ion concentration combined with a large negative to positive ion mass ratio is able to drive the spacecraft to the observed positive potentials. Despite the high electron depletions, the electron properties are found as a significant controlling factor for the spacecraft potential together with the magnetic field orientation which induces a potential gradient directed across Cassini’s asymmetric body. This study reveals the global spacecraft interaction experienced by Cassini during the Grand Finale and how this is influenced by the unexpected negative ion and dust populations.

  Oxford University Press (OUP), Apr. 2021, Monthly Notices of the Royal Astronomical Society, 504(1) (1), 964 - 973, English

  [Refereed]

  Scientific journal


• Development of the Three Dimensional Omnidirectional Scanning Phased Array Antenna

  Nobuyuki Kaya, Yohei Miyake, Koichi Nitta

  Aug. 2020, IEICE Technical Report, 120(138) (138), 41 - 44, Japanese

  [Invited]

  Symposium


• Electron Wing‐Like Structures Formed at a Negatively Charged Spacecraft Moving in a Magnetized Plasma

  Yohei Miyake, Wojciech Jacek Miloch, Solveig Kjus, Hans Laszlo Pecseli

  Spacecraft-plasma interactions are studied with self-consistent numerical simulations of magnetized plasmas, where electrons are strongly magnetized whereas ions are weakly magnetized. It is found that for a spacecraft in such a magnetized plasma corresponding to a low Earth orbit, electrons can be reflected from a negatively charged spacecraft and then guided by geomagnetic field lines. The reflected electrons can leave a sharp trail like wings if the spacecraft size is greater than an average electron gyroradius of the environment. Such an electron wing-like structure is associated with propagating Langmuir waves. This results in nontrivial asymmetric electrostatic potentials close to the spacecraft and even farther than the Debye screening distance. The convective electric field also gives rise to a differential potential of the spacecraft with respect to the plasma, resulting in yet another asymmetry in the plasma dynamics and the potential distribution around the spacecraft. These asymmetries in the plasma dynamics can significantly influence in-situ measurements of space plasma. The results show a good qualitative agreement with actual measurements by a satellite in the polar regions.

  Wiley, Feb. 2020, Journal of Geophysical Research: Space Physics, 125(2) (2), e2019JA027379, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Application of Cross-Reference Framework CoToCoA to Macro- and Micro-Scale Simulations of Planetary Magnetospheres

  Keiichiro Fukazawa, Yuto Katoh, Takeshi Nanri, Yohei Miyake

  IEEE, Nov. 2019, 2019 Seventh International Symposium on Computing and Networking Workshops (CANDARW), English

  [Refereed]

  International conference proceedings


• 宇宙機近傍プラズマ現象の数値シミュレーション

  三宅洋平, 臼井英之, 桐山武士, 白川遼, 田川雅人

  Sep. 2019, 混相流, 33(3) (3), 258 - 266, Japanese

  [Refereed]

  Scientific journal


• Numerical Study of Plasma Depletion Region in a Satellite Wake

  Hideyuki Usui, Yohei Miyake, Wojciech J. Miloch, Keisuke Ito

  Institute of Electrical and Electronics Engineers (IEEE), Aug. 2019, IEEE Transactions on Plasma Science, 47(8) (8), 3717 - 3723, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• The Particle-In- Cell simulation on LEO spacecraft charging and the wake structure using EMSES

  Nizam Ahmad, Usui Hideyuki, Miyake Yohei

  Mar. 2019, Journal of Advanced Simulation in Science and Engineering, 6, 21 - 31, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of booms of sounding rockets in flowing plasmas

  Joakim J, P. Paulsson, Miyake Yohei, Wojciech J. Miloch, Usui Hideyuki

  Mar. 2019, Physics of Plasmas, 26(3) (3), English

  [Refereed]

  Scientific journal


• Numerical Simulations of a Dust Grain in a Flowing Magnetized Plasma

  Diako Darian, Wojciech Jacek Miloch, Mikael Mortensen, Miyake Yohei, Usui Hideyuki

  2019, Physics of Plasmas, 26(4) (4), 043701, English

  [Refereed]

  Scientific journal


• Diagnosing low earth orbit satellite anomalies using NOAA-15 electron data associated with geomagnetic perturbations

  Nizam Ahmad, Dhani Herdiwijaya, Thomas Djamaluddin, Hideyuki Usui, Yohei Miyake

  A satellite placed in space is constantly affected by the space environment, resulting in various impacts from temporary faults to permanent failures depending on factors such as satellite orbit, solar and geomagnetic activities, satellite local time, and satellite construction material. Anomaly events commonly occur during periods of high geomagnetic activity that also trigger plasma variation in the low Earth orbit (LEO) environment. In this study, we diagnosed anomalies in LEO satellites using electron data from the Medium Energy Proton and Electron Detector onboard the National Oceanic and Atmospheric Administration (NOAA)-15 satellite. In addition, we analyzed the fluctuation of electron flux in association with geomagnetic disturbances 3 days before and after the anomaly day. We selected 20 LEO anomaly cases registered in the Satellite News Digest database for the years 2000–2008. Satellite local time, an important parameter for anomaly diagnosis, was determined using propagated two-line element data in the SGP4 simplified general perturbation model to calculate the longitude of the ascending node of the satellite through the position and velocity vectors. The results showed that the majority of LEO satellite anomalies are linked to low-energy electron fluxes of 30–100 keV and magnetic perturbations that had a higher correlation coefficient (~ 90%) on the day of the anomaly. The mean local time calculation for the anomaly day with respect to the nighttime migration of energetic electrons revealed that the majority of anomalies (65%) occurred on the night side of Earth during the dusk-to-dawn sector of magnetic local time.[Figure not available: see fulltext.].

  Springer Berlin Heidelberg, Dec. 2018, Earth, Planets and Space, 70(1) (1), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Particle in Cell Simulation to Study the Charging and Evolution of Wake Structure of LEO Spacecraft

  Nizam Ahmad, Hideyuki Usui, Yohei Miyake

  Last, Springer Singapore, Oct. 2018, Communications in Computer and Information Science, 946, 255 - 268, English, International magazine, Co-authored internationally

  [Refereed]

  In book


• Dependence of Generation of Whistler Mode Chorus Emissions on the Temperature Anisotropy and Density of Energetic Electrons in the Earth's Inner Magnetosphere

  Y. Katoh, Y. Omura, Y. Miyake, H. Usui, H. Nakashima

  We carry out a series of self-consistent electron hybrid code simulations for the dependence of chorus generation process on the temperature anisotropy and density of energetic electrons in the Earth's inner magnetosphere. We use the same magnetic field gradient in the simulation system and different temperature anisotropy AT for the initial distribution of energetic electrons at the magnetic equator. We conduct 6 sets of simulations for different AT from 4 to 9, changing the initial number density Nh of energetic electrons at the equator in each set of simulations. By analyzing the spectra obtained in the simulation results, we identify chorus elements with rising tones in the results for higher Nh but no distinct chorus in smaller Nh. We compare the simulation results with estimations of the threshold and optimum amplitude proposed by the nonlinear wave growth theory. We find that the chorus generation processes reproduced in the simulation results are consistently explained by the theoretical estimates. We also compare the simulation results with linear growth rates for all simulation runs. We find clear disagreement between the spectral characteristics of reproduced chorus and the predictions by the linear theory. The present study clarifies that the spectra of chorus are essentially different from those predicted by the linear theory and are determined fully by nonlinear processes of wave-particle interactions in the chorus generation region.

  Blackwell Publishing Ltd, Feb. 2018, Journal of Geophysical Research: Space Physics, 123(2) (2), 1165 - 1177, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Particle simulations of electric and dust environment near the lunar vertical hole

  Y. Miyake, Y. Funaki, M. N. Nishino, H. Usui

  We study the electric and dust environment near a complex surface structure on the moon: a vertical hole. In order to model an electric field structure near the surface, we performed the particle-in-cell simulations. The simulations provide electric field and plasma current density profiles in three-dimensional space above the complex lunar surface topography. Subsequently, we applied the obtained electric field and plasma current density data to the test-particle simulation on the dynamics of submicronsized charged dust grains. We focus on an effect of a stochastic charging process of such small dust grains. Because of their small surface areas, the dusts will get/lose one elementary charge infrequently. The preliminary simulation results show an evidence of dust mobilization across the sunlight-shadow interface formed inside the lunar hole.

  American Institute of Physics Inc., Jan. 2018, AIP Conference Proceedings, 1925, 020001, English

  [Refereed]

  International conference proceedings


• Numerical simulations of a sounding rocket in ionospheric plasma: Effects of magnetic field on the wake formation and rocket potential

  D. Darian, S. Marholm, J. J. P. Paulsson, Y. Miyake, H. Usui, M. Mortensen, W. J. Miloch

  The charging of a sounding rocket in subsonic and supersonic plasma flows with external magnetic field is studied with numerical particle-in-cell (PIC) simulations. A weakly magnetized plasma regime is considered that corresponds to the ionospheric F-2 layer, with electrons being strongly magnetized, while the magnetization of ions is weak. It is demonstrated that the magnetic field orientation influences the floating potential of the rocket and that with increasing angle between the rocket axis and the magnetic field direction the rocket potential becomes less negative. External magnetic field gives rise to asymmetric wake downstream of the rocket. The simulated wake in the potential and density may extend as far as 30 electron Debye lengths; thus, it is important to account for these plasma perturbations when analyzing in situ measurements. A qualitative agreement between simulation results and the actual measurements with a sounding rocket is also shown.

  AMER GEOPHYSICAL UNION, Sep. 2017, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 122(9) (9), 9603 - 9621, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Large Scale Manycore-Aware PIC Simulation with Efficient Particle Binning

  Hiroshi Nakashima, Yoshiki Summura, Keisuke Kikura, Yohei Miyake

  We are now developing a manycore-aware implementation of multiprocessed PIC (particle-in-cell) simulation code with automatic load balancing. A key issue of the implementation is how to exploit the wide SIMD mechanism of manycore processors such as Intel Xeon Phi. Our solution is 'particle binning' to rank all particles in a cell (voxel) in a chunk of SOA (structure-of-arrays) type one-dimensional arrays so that 'particle-push' and 'current-scatter' operations on them are efficiently SIMD-vectorized by our compiler. In addition, our sophisticated binning mechanism performs sorting of particles according to their positions 'on-the-fly', efficiently coping with occasional 'bin overflow' in a fully multithreaded manner. Our performance evaluation with up to 64 nodes of Cray XC30 and XC40 supercomputers, equipped with Xeon Phi 5120D (Knights Corner) and 7250 (Knights Landing) respectively, not only exhibited good parallel performance, but also proved the effectiveness of our binning mechanism.

  Last, Institute of Electrical and Electronics Engineers Inc., Jun. 2017, Proceedings - 2017 IEEE 31st International Parallel and Distributed Processing Symposium, IPDPS 2017, 202 - 212, English

  [Refereed]

  International conference proceedings


• Electron dynamics in the minimagnetosphere above a lunar magnetic anomaly

  Hideyuki Usui, Yohei Miyake, Masaki N. Nishino, Takuma Matsubara, Joseph Wang

  We consider a three-dimensional electromagnetic particle-in-cell simulation of the boundary layer current in a minimagnetosphere created by the interaction between a magnetized plasma flow, which models the typical solar wind, and a small-scale magnetic dipole, which represents the Reiner Gamma magnetic anomaly on the lunar surface. The size of this magnetic anomaly (measured as the distance from the dipole center to the position where the pressure of the local magnetic field equals the dynamic pressure of the solar wind) is one quarter that of the Larmor radius of the solar wind ions. In spite of the weak magnetization of the ions, a minimagnetosphere is formed above the magnetic anomaly. In the boundary layer of the minimagnetosphere, the electron current is dominant. Due to the intense electric field induced by charge separation, electrons entering the boundary layer undergo E x B drift. In each hemisphere, the electron boundary current due to the drift shows a structure where the convection reverses; these structures are symmetric with respect to the magnetic equator. Detailed analysis of the electron cyclotron motion shows that electrons at the edge of the inner boundary layer obtain maximum velocity by the electric field acceleration due to the charge separation, not due to the drift of the electron's guiding center. The maximum electron velocity is approximately 8 times that of the upstream plasma. The width of the boundary layer current becomes approximately equal to the radius of the local electron cyclotron.

  AMER GEOPHYSICAL UNION, Feb. 2017, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 122(2) (2), 1555 - 1571, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Particle-in-cell modeling of spacecraft-plasma interaction effects on double-probe electric field measurements

  Y. Miyake, H. Usui

  The double-probe technique, commonly used for electric field measurements in magnetospheric plasmas, is susceptible to environmental perturbations caused by spacecraft-plasma interactions. To better model the interactions, we have extended the existing particle-in-cell simulation technique so that it accepts very small spacecraft structures, such as thin wire booms, by incorporating an accurate potential field solution calculated based on the boundary element method. This immersed boundary element approach is effective for quantifying the impact of geometrically small but electrically large spacecraft elements on the formation of sheaths or wakes. The developed model is applied to the wake environment near a Cluster satellite for three distinctive plasma conditions: the solar wind, the tail lobe, and just outside the plasmapause. The simulations predict the magnitudes and waveforms of wake-derived spurious electric fields, and these are in good agreement with in situ observations. The results also reveal the detailed structure of potential around the double probes. It shows that any probes hardly experience a negative wake potential in their orbit, and instead, they experience an unbalanced drop rate of a large potential hill that is created by the spacecraft and boom bodies. As a by-product of the simulations, we also found a photoelectron short-circuiting effect that is analogous to the well-known short-circuiting effect due to the booms of a double-probe instrument. The effect is sustained by asymmetric photoelectron distributions that cancel out the external electric field.

  AMER GEOPHYSICAL UNION, Dec. 2016, Radio Science, 51(12) (12), 1905 - 1922, English, International magazine

  [Refereed][Invited]

  Scientific journal


• Electron Hybrid Code Simulations with OhHelp Load Balancer for the Study of Relativistic Electron Acceleration in Planetary Magnetospheres

  KATOH Yuto, OMURA Yoshiharu, MIYAKE Yohei, NAKASHIMA Hiroshi, USUI Hideyuki, FUKAZAWA Keiichiro

  2016, Proceedings 2016 JSST International Conference on Simulation Technology, English

  [Refereed][Invited]

  International conference proceedings


• Electrostatic environment near lunar vertical hole: 3D plasma particle simulations

  Yohei Miyake, Masaki N. Nishino

  The dayside electrostatic environment near the lunar surface is governed by interactions among the solar wind plasma, photoelectrons, and the charged lunar surface, providing topologically complex boundaries to the plasma. Three-dimensional, particle-in-cell simulations are applied to recently discovered vertical holes on the Moon, which have spatial scales of tens of meters and greater depth-to-diameter ratios than typical impact craters. The vertical wall of the hole introduces a new boundary for both photo and solar wind electrons. The current balance condition established at a hole bottom is altered by the limited solar wind electron penetration into the hole due to loss at the wall and photoelectron current path connecting the hole bottom and wall surfaces. The self-consistent modeling not only reproduces intense differential charging between sunlit and shadowed surfaces, but also reveals the potential difference between sunlit surfaces inside and outside the hole, demonstrating the uniqueness of the near-hole electrostatic environment. (C) 2015 Elsevier Inc. All rights reserved.

  ACADEMIC PRESS INC ELSEVIER SCIENCE, Nov. 2015, Icarus, 260, 301 - 307, English

  [Refereed]

  Scientific journal


• Asymmetric electrostatic environment around spacecraft in weakly streaming plasmas

  Y. Miyake, Y. Nishimura, Y. Kasaba

  The double-probe electric field measurements in drifting plasmas are subject to spurious effects caused by asymmetric electrostatic structure near scientific spacecraft. Some in situ observations just outside the plasmasphere detected spurious electric fields due to such environmental asymmetry even in subsonic ion flows across the magnetic field line. We have performed three-dimensional particle-in-cell simulations, which allow us to include long and extremely thin wire booms as well as a spacecraft chassis, and investigated an electrostatic environment that accounts for the observations. The present simulations reveal that even subsonic ion flows can produce an appreciable potential difference between the upstream and downstream sides of the spacecraft, and the potential difference would be detected as a spurious field of a few mV/m. The necessary condition for the spurious field is a relatively high (a few tens of V) spacecraft potential, and also the spacecraft potential hump needs to be expanded by thin wire booms biased at the spacecraft potential. The analysis also reveals that the presence of a heavy ion flow and a field-aligned ion upflow can further enhance the spurious field up to 5 mV/m.

  AMER GEOPHYSICAL UNION, Aug. 2015, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 120(8) (8), 6357 - 6370, English

  [Refereed]

  Scientific journal


• PIC simulation on plasma flow response to a mesoscale magnetic dipole in space

  Hideyuki Usui, M. Umezawa, Y. Miyake, T. Moritaka

  We have been studying plasma flow response to a mesoscale magnetic dipole in space by means of full kinetic simulations using Particle-In-Cell method. The size of magnetic dipole structure is characterized by distance L at which the pressure equilibrium is satisfied between the dipole magnetic field and the plasma flow under the MHD approximation. We focus on a mesoscale magnetic dipole in which L is smaller than the ion Larmor radius or the ion inertial length but larger than the electron Lamor radius. In this situation, the plasma kinetics such as finite Larmor radius effect will play an important role to determine the plasma response to the magnetic dipole. In the simulations, we found that a mesoscale magnetosphere is created even though the magnetization of ions is weak. In the dayside region, charge separation occurs because of the difference of dynamics between magnetized electrons and unmagnetized ions and intense electrostatic field is induced. The incoming ion flow to the dipole fields is eventually influenced by this electric field and the ions’ trajectories are largely distorted. The width of the boundary current layer as well as the spatial gradient of the local magnetic field compression in the dayside region can be characterized by the electron Larmor radius and is independent of ion’s spatial scale. Meanwhile the KAGUYA spacecraft also observed ion reflection and electron heating and acceleration over crustal magnetic anomalies on the lunar surface. By performing threedimensional PIC simulation, we started to examine the solar wind interactions with the magnetic anomaly called Reiner Gamma on the lunar surface. We will discuss some of the simulation results on the plasma behavior over the magnetic anomaly.

  American Institute of Aeronautics and Astronautics Inc, AIAA, 2015, 53rd AIAA Aerospace Sciences Meeting, English

  [Refereed]

  International conference proceedings


• Full kinetic simulations of plasma flow interactions with meso- and microscale magnetic dipoles

  Y. Ashida, H. Usui, I. Shinohara, M. Nakamura, I. Funaki, Y. Miyake, H. Yamakawa

  We examined the plasma flow response to meso- and microscale magnetic dipoles by performing three-dimensional full particle-in-cell simulations. We particularly focused on the formation of a magnetosphere and its dependence on the intensity of the magnetic moment. The size of a magnetic dipole immersed in a plasma flow can be characterized by a distance L from the dipole center to the position where the pressure of the local magnetic field becomes equal to the dynamic pressure of the plasma flow under the magnetohydrodynamics (MHD) approximation. In this study, we are interested in a magnetic dipole whose L is smaller than the Larmor radius of ions r(iL) calculated with the unperturbed dipole field at the distance L from the center. In the simulation results, we confirmed the clear formation of a magnetosphere consisting of a magnetopause and a tail region in the density profile, although the spatial scale is much smaller than the MHD scale. One of the important findings in this study is that the spatial profiles of the plasma density as well as the current flows are remarkably affected by the finite Larmor radius effect of the plasma flow, which is different from the Earth's magnetosphere. The magnetopause found in the upstream region is located at a position much closer to the dipole center than L. In the equatorial plane, we also found an asymmetric density profile with respect to the plasma flow direction, which is caused by plasma gyration in the dipole field region. The ion current layers are created in the inner region of the dipole field, and the electron current also flows in the region beyond the ion current layer because ions with a large inertia can closely approach the dipole center. Unlike the ring current structure of the Earth's magnetosphere, the current layers in the microscale dipole fields are not circularly closed around the dipole center. Since the major current is caused by the particle gyrations, the current is independently determined to be in the direction of the electron and ion gyrations, which are the same in both the upstream and downstream regions. The present analysis on the formation of a magnetosphere in the regime of a microscale magnetic dipole is significant for understanding the solar wind response to the crustal magnetic anomalies on the Moon surface, such as were recently observed by spacecraft. (C) 2014 AIP Publishing LLC.

  AMER INST PHYSICS, Dec. 2014, PHYSICS OF PLASMAS, 21(12) (12), 122903, English

  [Refereed]

  Scientific journal


• Cross-comparison of spacecraft-environment interaction model predictions applied to Solar Probe Plus near perihelion

  R. Marchand, Y. Miyake, H. Usui, J. Deca, G. Lapenta, J. C. Mateo-Velez, R. E. Ergun, A. Sturner, V. Genot, A. Hilgers, S. Markidis

  Five spacecraft-plasma models are used to simulate the interaction of a simplified geometry Solar Probe Plus (SPP) satellite with the space environment under representative solar wind conditions near perihelion. By considering similarities and differences between results obtained with different numerical approaches under well defined conditions, the consistency and validity of our models can be assessed. The impact on model predictions of physical effects of importance in the SPP mission is also considered by comparing results obtained with and without these effects. Simulation results are presented and compared with increasing levels of complexity in the physics of interaction between solar environment and the SPP spacecraft. The comparisons focus particularly on spacecraft floating potentials, contributions to the currents collected and emitted by the spacecraft, and on the potential and density spatial profiles near the satellite. The physical effects considered include spacecraft charging, photoelectron and secondary electron emission, and the presence of a background magnetic field. Model predictions obtained with our different computational approaches are found to be in agreement within 2% when the same physical processes are taken into account and treated similarly. The comparisons thus indicate that, with the correct description of important physical effects, our simulation models should have the required skill to predict details of satellite-plasma interaction physics under relevant conditions, with a good level of confidence. Our models concur in predicting a negative floating potential V-fl similar to -10V for SPP at perihelion. They also predict a "saturated emission regime" whereby most emitted photo-and secondary electron will be reflected by a potential barrier near the surface, back to the spacecraft where they will be recollected. (C) 2014 AIP Publishing LLC.

  AMER INST PHYSICS, Jun. 2014, Physics of Plasmas, 21(6) (6), 062901, English

  [Refereed]

  Scientific journal


• Electron behavior in ion beam neutralization in electric propulsion: full particle-in-cell simulation

  Hideyuki Usui, Akihiko Hashimoto, Yohei Miyake

  By performing full Particle-In-Cell simulations, we examined the transient response of electrons released for the charge neutralization of a local ion beam emitted from an ion engine which is one of the electric propulsion systems. In the vicinity of the engine, the mixing process of electrons in the ion beam region is not so obvious because of large difference of dynamics between electrons and ions. A heavy ion beam emitted from a spacecraft propagates away from the engine and forms a positive potential region with respect to the background. Meanwhile electrons emitted for a neutralizer located near the ion engine are electrically attracted or accelerated to the core of the ion beam. Some electrons with the energy lower than the ion beam potential are trapped in the beam region and move along with the ion beam propagation with a multi-streaming structure in the beam potential region. Since the locations of the neutralizer and the ion beam exit are different, the above-mentioned bouncing motion of electrons is also observed in the direction of the beam diameter.

  IOP PUBLISHING LTD, 2013, 24TH IUPAP CONFERENCE ON COMPUTATIONAL PHYSICS (IUPAP-CCP 2012), 454, English

  [Refereed]

  International conference proceedings

  Link to Kobe Univ. Repository (Kernel)


• Plasma particle simulations of wake formation behind a spacecraft with thin wire booms

  Y. Miyake, C. M. Cully, H. Usui, H. Nakashima

  Double-probe electric field sensors installed on scientific spacecraft are often deployed using wire booms with radii much less than typical Debye lengths of magnetospheric plasmas (millimeters compared to tens of meters). However, in tenuous and cold-streaming plasmas seen in the polar cap and lobe regions, the wire booms, electrically grounded at the spacecraft, have a high positive potential due to photoelectron emission and can strongly scatter approaching ions. Consequently, an electrostatic wake formed behind the spacecraft is further enhanced by the presence of the wire booms. We reproduce this process for the case of the Cluster satellite by performing plasma particle-in-cell (PIC) simulations, which include the effects of both the spacecraft body and the wire booms in a simultaneous manner. The simulations reveal that the effective thickness of the booms for the Cluster Electric Field and Wave (EFW) instrument is magnified from its real diameter (2.2mm) to several meters, when the spacecraft potential is at tens of volts. Such booms enhance the wake electric field magnitude by a factor of 1.5-2 depending on the spacecraft potential and play a principal role in explaining the in situ Cluster EFW data showing sinusoidal spurious electric fields with about 10mV/m amplitude. The boom effects are quantified by comparing PIC simulations with and without wire booms and also by examining the wake formation for various spacecraft potentials. Key Points Particle-in-cell simulations of spacecraft wakes formed in streaming cold ionsQuantification of the wake enhancement effect by thin wire boom instrumentParameterization of spurious electric field waveforms induced by the wakes ©2013. American Geophysical Union. All Rights Reserved.

  Blackwell Publishing Ltd, 2013, Journal of Geophysical Research: Space Physics, 118(9) (9), 5681 - 5694, English

  [Refereed]

  Scientific journal


• Low-cost load balancing for parallel particle-in-cell simulations with thick overlapping layers

  Yohei Miyake, Hiroshi Nakashima

  This paper describes a parallel implementation of our practical particle-in-cell (PIC) simulator with the OhHelp dynamic load-balancing algorithm. Although the code parallelization is based on simple block domain decomposition, OhHelp accomplishes load balancing and thus the scalability in terms of the number of particles by making each computation node help another heavily loaded node. In addition to the OhHelp application, a number of additional layers overlapping with adjacent domains are newly introduced outside the boundaries of each subdomain for the purpose of minimizing overhead costs of OhHelp. The optimization can drastically reduce overhead costs for particle transfer among nodes, whereas it leads to increase in domain size which each node is responsible for. Despite this trade-off feature, the overlapping layer attachment and a further lower-level optimization exert 1.8-fold improvement of the PIC simulator performance. Consequently, the optimized simulator exhibits a good scalability and a stable efficiency in parallel executions using up to 4096 cores, showing small parallel efficiency degradation of 3% from 16-to 4096-core parallel executions. © 2013 IEEE.

  IEEE, 2013, Proceedings - 12th IEEE International Conference on Trust, Security and Privacy in Computing and Communications, TrustCom 2013, 1107 - 1114, English

  [Refereed]

  International conference proceedings


• Plasma particle simulations on stray photoelectron current flows around a spacecraft

  Y. Miyake, H. Usui, H. Kojima, H. Nakashima

  In tenuous space plasmas, photoelectron flows produce complex current paths among multiple conducting elements of spacecraft, which may influence the current-voltage characteristics of double-probe electric field sensors. We performed full-particle simulations on this effect by assuming a sensor configuration that is typical of recent designs like those on Cluster, THEMIS, and BepiColombo/MMO; the spherical probe is separated from a conducting boom by biased electrodes known as the 'stub' and the 'guard'. The assumed bias potential scheme corresponds to that planned for BepiColombo/MMO and is different from those used in the other satellites. The analysis focuses on stray photoelectron currents flowing from these electrodes and a spacecraft body. Photoelectrons approaching the probe are commonly repelled by the guard, the potential of which is strongly biased negatively, and are subsequently affected by the probe potential. Consequently, the photoelectron current magnitude increases with increasing probe potential regardless of their origins, when the probe operates between the plasma and floating spacecraft potentials. The result indicates that both photoelectron currents from the spacecraft body and biased electrodes can be minimized by selecting the probe working potential as close as possible to the plasma potential. We also examine the photoelectron current dependence on the presence or absence of the guard electrode operation and confirm a positive effect of reducing the photoelectron current from the spacecraft. However, negative side effects of the guard operation enhance the photoelectron currents from the stub and guard, when the probe operates nearly at the plasma potential.

  AMER GEOPHYSICAL UNION, Sep. 2012, Journal of Geophysical Research: Space Physics, 117(A9) (A9), A09210, English

  [Refereed]

  Scientific journal


• Development of a Scalable PIC Simulator and Its Application to Spacecraft-Plasma Interaction Problems

  Yohei Miyake, Hiroshi Nakashima, Hideyuki Usui

  May 2012, Proceedings of International Conference on Simulation Technology (JSST 2012), 262 - 267, English

  [Refereed]

  International conference proceedings


• Numerical Simulation of Microwave Plasma in Air Breathing Ion Engine

  Takahito Motoyama, Hideyuki Usui, Yohei Miyake, Akihiko Hashimoto

  Japan Society for Simulation Technology, 2012, Proceedings of International Conference on Simulation Technology (JSST 2012), 62 - 64, English

  [Refereed]

  International conference proceedings


• Full PIC Simulation of Ion Beam Neutralization

  Hideyuki Usui, Akihiko Hashimoto, Yohei Miyake

  Japan Society for Simulation Technology, 2012, Proceedings of International Conference on Simulation Technology (JSST 2012), 583 - 586, English

  [Refereed]

  International conference proceedings


• Plasma Particle Simulations on Electric Antenna and Spacecraft Environment

  Yohei Miyake, Hideyuki Usui, Hirotsugu Kojima

  Recent expansion and sophistication of electric antenna applications in space missions increase the demand for better understanding of plasma and electromagnetic environment around the electric antenna and spacecraft. Because of strong plasma inhomogeneity emerging around the antenna and spacecraft, antenna behavior is difficult to resolve analytically and thus should be analyzed by means of some numerical approaches such as a plasma simulation. Actually, a practical merit of the plasma simulation has been demonstrated through its application to an analysis of antenna impedance in plasma [1]. Also, such a numerical approach has further advantages for an analysis of modern electric antennas equipped with distinctive devices: e.g., a photoelectron guard electrode, which greatly complicates the antenna-plasma interactions. In the present study, we apply the particle-in-cell simulations to the studies of the antenna and spacecraft environment. We particularly focus on electric properties of modern electric antennas used for static electric field measurements and plasma wave observations. © 2011 IEEE.

  Oct. 2011, Proceedings of 2011 XXXth URSI General Assembly and Scientific Symposium, 1 - 1, English

  [Refereed]

  International conference proceedings


• Effects of the guard electrode on the photoelectron distribution around an electric field sensor

  Y. Miyake, H. Usui, H. Kojima

  We have developed a numerical model of a double-probe electric field sensor equipped with a photoelectron guard electrode for the particle-in-cell simulation. The model includes typical elements of modern double-probe sensors on, e.g., BepiColombo/MMO, Cluster, and THEMIS spacecraft, such as a conducting boom and a preamplifier housing called a puck. The puck is also used for the guard electrode, and its potential is negatively biased by reference to the floating spacecraft potential. We apply the proposed model to an analysis of an equilibrium plasma environment around the sensor by assuming that the sun illuminates the spacecraft from the direction perpendicular to the sensor deployment axis. As a simulation result, it is confirmed that a substantial number of spacecraft-originating photoelectrons are once emitted sunward and then fall onto the puck and sensing element positions. In order to effectively repel such photoelectrons coming from the sun direction, a potential hump for electrons, i.e., a negative potential region, should be created in a plasma region around the sunlit side of the guard electrode surface. The simulation results reveal the significance of the guard electrode potential being not only lower than the spacecraft body but also lower than the background plasma potential of the region surrounding the puck and the sensing element. One solution for realizing such an operational condition is to bias the guard potential negatively by reference to the sensor potential because the sensor is usually operated nearly at the background plasma potential.

  AMER GEOPHYSICAL UNION, May 2011, Journal of Geophysical Research: Space Physics, 116, English

  [Refereed]

  Scientific journal


• 柔軟かつ直観的な記述が可能なジョブ並列スクリプト言語Xcrypt

  平石拓, 安部達也, 三宅洋平, 岩下武史, 中島浩

  May 2010, 先端的計算基盤システムシンポジウムSACSIS 2010論文集 (IPSJ Symposium Series), 2010(5) (5), 183 - 191, Japanese

  [Refereed]

  Symposium


• Miniaturization of Plasma Wave Receivers onboard Scientific Satellites and Application to the Sensor Network System for Monitoring Electromagnetic Environments in Space

  H. Kojima, H. Fukuhara, Y. Mizuochi, S. Yagitani, H. Ikeda, Y. Miyake, H. Usui, H. Iwai, Y. Takizawa, Y. Ueda, H. Yamakawa

  © World Scientific Publishing Company. Attempts have been made to achieve extreme miniaturization in plasma wave receivers for future space science missions. The plasma wave receivers onboard scientific satellites are classified into two types: waveform receivers and spectrum analyzers. The present paper describes one-chip waveform type receivers that are developed using analogue ASIC technology. We incorporate the necessary analogue components of the waveform receiver into a chip having dimensions of 3mm × 3mm and confirm the functionality and performance of the chip. The performance and quality of the chip are shown to be sufficient for use in science missions. Furthermore, we extend the application of the miniaturized plasma wave receivers to a sensor network system in space. The sensor network system consists of several small sensor nodes that are distributed randomly throughout the target area and monitor the spatial and time variation of electromagnetic environments in space. We then introduce the concept of this sensor network system and present results obtained during the development of the small sensor node for use in this sensor network in space.

  Jan. 2010, Advances in Geosciences: Solar Terrestrial (ST), 21, 461 - 481, English

  [Refereed]

  In book


• New electromagnetic particle simulation code for the analysis of spacecraft-plasma interactions

  Yohei Miyake, Hideyuki Usui

  A novel particle simulation code, the electromagnetic spacecraft environment simulator (EMSES), has been developed for the self-consistent analysis of spacecraft-plasma interactions on the full electromagnetic (EM) basis. EMSES includes several boundary treatments carefully coded for both longitudinal and transverse electric fields to satisfy perfect conductive surface conditions. For the longitudinal component, the following are considered: (1) the surface charge accumulation caused by impinging or emitted particles and (2) the surface charge redistribution, such that the surface becomes an equipotential. For item (1), a special treatment has been adopted for the current density calculated around the spacecraft surface, so that the charge accumulation occurs exactly on the surface. As a result, (1) is realized automatically in the updates of the charge density and the electric field through the current density. Item (2) is achieved by applying the capacity matrix method. Meanwhile, the transverse electric field is simply set to zero for components defined inside and tangential to the spacecraft surfaces. This paper also presents the validation of EMSES by performing test simulations for spacecraft charging and peculiar EM wave modes in a plasma sheath.

  AMER INST PHYSICS, Jun. 2009, Physics of Plasmas, 16(6) (6), 62904, English

  [Refereed]

  Scientific journal


• Particle-In-Cell Simulation on the Characteristics of a Receiving Antenna in Space Plasma Environment

  Yohei Miyake, Hideyuki Usui, Hirotsugu Kojima, Yoshiharu Omura

  We applied the electromagnetic Particle-In-Cell simulation to the analysis of receiving antenna characteristics in space plasma environment. In the analysis, we set up external waves in a simulation region and receive them with a numerical antenna model placed in the simulation region. Using this method, we evaluated the effective length of electric field antennas used for plasma wave investigations conducted by scientific spacecraft. We particularly focused on the effective length of an electric field instrument called MEFISTO for a future mission to Mercury: BepiColombo. We first confirmed that the effective length of the MEFISTO-type antenna is basically longer than that of a simple dipole antenna for both electrostatic and electromagnetic plasma waves. By applying the principle of a voltmeter, the effective length of the MEFISTO-type antenna is predicted to become identical to the separation between two sensor-conductor's midpoints. However, the numerical result revealed that the actual effective length becomes shorter than the prediction, which is caused by the shorting-out effect due to the presence of a center boom conductor between the two sensor conductors. Since the above effect is difficult to treat theoretically, the present numerical method is a powerful tool for further quantitative evaluation of the antenna characteristics.

  AMER INST PHYSICS, 2009, Proceedings of the 26th International Symposium on Rarefied Gas Dynamics (RGD26), 1084, 895 - 900, English

  [Refereed]

  International conference proceedings


• OhHelp: A Scalable Domain-Decomposing Dynamic Load Balancing for Particle-in-Cell Simulations

  Hiroshi Nakashima, Yohei Miyake, Hideyuki Usui, Yoshiharu Omura

  This paper proposes a new method for Particle-in-Cell (PIC) simulations which aims at achieving both good load balancing and scalability so as to be efficiently executed on distributed memory systems. This method, named OhHelp, simply and equally partitions the space domain where charged particles reside and assigns each partitioned subdomain to each computation node for scalable simulation with respect to the size of the domain. Load balancing and thus the scalability in terms of the number of particles are accomplished by making each node help another heavily loaded node which deputes a part of particles in its subdomain and replicated subdomain field data to its helpers. The OhHelp load balancer monitors particle movements through subdomain boundaries to check if the helpand-helpers configuration keeps good load balancing and, when unacceptable imbalance is found, dynamically reconfigures it to regain perfect balancing. The efficiency and scalability of OhHelp are confirmed through our experiment with a production-level full-3D plasma simulator and with uniform and non-uniform particle distributions. As a result, we found 256-core parallel simulations, including an extremely imbalanced setting to pack all the particles in a small region, exert 159-190 speedup compared to sequential execution.

  ASSOC COMPUTING MACHINERY, 2009, Proceedings of the 2009 ACM SIGARCH International Conference on Supercomputing, 90 - 99, English

  [Refereed]

  International conference proceedings


• OpenMP Parallelization Method for Current Calculation in Plasma Particle Simulation

  臼井英之, 杉崎 由典, 冨田 清司, 大村 善治, 三宅 洋平, 青木 正樹

  プラズマ粒子シミュレーションで電磁界成分を更新する際には電流値が必要であり，そのために，個々の粒子の運動量を各空間格子点に集める必要がある．しかし，粒子が空間的にランダムに分布しているため，電流計算の並列演算による高速化は容易ではなく工夫を要する．本論文では，粒子の位置情報を利用して各スレッドに粒子を明示的に割り当てるスレッド並列化アルゴリズムを新しく提案し，OpenMPを用いた実装によりその有効性を検証した．動作検証により，提案手法のCPU台数効果はシミュレーション内の空間格子数の影響を受け，粒子数密度の影響はないことが分かった．特に，各スレッドに割り当てられた空間格子配列がキャッシュに収まりきる程度に細分化される場合，並列台数効果を得やすいことを明らかにした．特に並列台数10前後の場合，その台数効果はスーパリニアとなり，自動並列化コンパイラを用いた電流ルーチン実装に比べて高速になることを明らかにした．また，本提案手法は，各スレッドで全粒子を走査する冗長的な並列化方法であるため，従来アルゴリズムで用いられていた作業領域用配列は不要となり，シミュレーションに必要なメモリ容量を大幅に節約できることを示した．In Particle-In-Cell (PIC) plasma simulations, we calculate the current density to advance the electromagnetic fields. One of the ways to obtain the current density is to gather the velocity moment of each particle to the adjacent grid points. The current calculation is not basically parallelized because the particle positions, which are random in the simulation space, are independent of the array number of current density. In the present paper, we propose a new parallelization method which explicitly associates particles to threads by using OpenMP and evaluate the performance of the proposed method. We clarified that the scalability performance is affected by the number of spatial grid points and is independent of the number of particle per grid. In the proposed method, each thread is in charge of a part of the array of current density divided with the number of thread. When the memory size of the array allocated to each thread becomes small and close to the data cache size of CPU, we found that the scalability performance shows super-linear characteristics and the execution needs less time than the case of using the automatic parallelization compiler. In addition, each thread redundantly scans the particle array to obtain the information of the particle positions for assigning the corresponding particles in charge. Because of this redundant parallelization, we do not have to use work arrays and can save the memory consumed for simulations.

  情報処理学会, Aug. 2008, 情報処理学会論文誌. コンピューティングシステム, 1(2) (2), 250 - 260, Japanese

  [Refereed]


• Analysis of photoelectron effect on the antenna impedance via Particle-In-Cell simulation

  Y. Miyake, H. Usui

  We present photoelectron effects on the impedance of electric field antennas used for plasma wave investigations. To illustrate the photoelectron effects, we applied electromagnetic Particle-In-Cell simulation to the self-consistent antenna impedance analysis. We confirmed the formation of a dense photoelectron region around the sunlit surfaces of the antenna and the spacecraft. The dense photoelectrons enhance the real part, and decrease the absolute value of the imaginary part, of antenna impedance at low frequencies. We also showed that the antenna conductance can be analytically calculated from simulation results of the electron current flowing into or out of the antenna. The antenna impedance in the photoelectron environment is represented by a parallel equivalent circuit consisting of a capacitance and a resistance, which is consistent with empirical knowledge. The results also imply that the impedance varies with the spin of the spacecraft, which causes the variation of the photoelectron density around the antenna.

  AMER GEOPHYSICAL UNION, Aug. 2008, RADIO SCIENCE, 43(4) (4), English

  [Refereed]

  Scientific journal


• Electromagnetic Particle-In-Cell simulation on the impedance of a dipole antenna surrounded by an ion sheath

  Y. Miyake, H. Usui, H. Kojima, Y. Omura, H. Matsumoto

  We have newly developed a numerical tool for the analysis of antenna impedance in plasma environment by making use of electromagnetic Particle-In-Cell (PIC) plasma simulations. To validate the developed tool, we first examined the antenna impedance in a homogeneous kinetic plasma and confirmed that the obtained results basically agree with the conventional theories. We next applied the tool to examine an ion-sheathed dipole antenna. The results confirmed that the inclusion of the ion-sheath effects reduces the capacitance below the electron plasma frequency. The results also revealed that the signature of impedance resonance observed at the plasma frequency is modified by the presence of the sheath. Since the sheath dynamics can be solved by the PIC scheme throughout the antenna analysis in a self-consistent manner, the developed tool has feasibility to perform more practical and complicated antenna analyses that will be necessary in real space missions.

  AMER GEOPHYSICAL UNION, May 2008, RADIO SCIENCE, 43(3) (3), English

  [Refereed]

  Scientific journal


• Effect of Photoelectrons on the Impedance of Electric Field Antenna onboard Spacecraft

  Yohei Miyake, Hideyuki Usui, Hirotsugu Kojima, Yoshiharu Omura, Hiroshi Matsumoto

  Aug. 2007, Proceedings of 2007 International Symposium on Antennas and Propagation (ISAP), 700 - 703, English

  [Refereed]

  International conference proceedings


• Effect of photoelectrons on electric field antenna in space

  Hideyuki Usui, Yohei Miyake

  The quantitative understanding of the antenna characteristics in space plasma environment is required in the wave data calibration as well as in the antenna design for future missions. In the present paper, we particularly focus on the effects of photoelectron emission on the antenna characteristics. We will describe the three-dimensional electromagnetic PIC simulations which were performed to examine the photoelectron environment around the antenna and its effect on the antenna impedance.

  2007, Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting, 5, 3479 - 3486, English, International magazine

  [Refereed]

  International conference proceedings


• Development and application of Geospace Environment Simulator for the analysis of spacecraft-plasma interactions

  Hideyuki Usui, Yohei Miyake, Masaki Okada, Yoshiharu Omura, Tooru Sugiyama, Ken T. Murata, Daisuke Matsuoka, Hiroko O. Ueda

  Space development has been rapidly increasing, and a strong demand should arise regarding the understanding of the spacecraft-plasma interactions, which is one of the very important issues associated with the human activities in space. To evaluate the spacecraft-plasma interactions including plasma kinetics, transient process, and electromagnetic field variation, the authors have started to develop a numerical plasma chamber called Geospace Environment Simulator (GES) by making the most use of the conventional full particle-in-cell plasma simulations. For the development of a proto model of GES, the authors have used the Earth Simulator, which is one of the fastest supercomputers in the world. GES can be regarded as a numerical chamber in which space experiments can be virtually performed and temporal and spatial evolutions of spacecraft-plasma interactions can be analyzed. In this paper, the authors have briefly introduced GES in terms of its concept, modeling, and research targets. As one of the research topics of GES, the authors have investigated the impedance variation of electric field antenna onboard scientific satellites in the photoelectron environment in space. From the preliminary simulation results, the large change of reactance of the antenna impedance below the characteristic frequency corresponding to the local plasma frequency determined by the photoelectron density could be confirmed.

  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Oct. 2006, IEEE TRANSACTIONS ON PLASMA SCIENCE, 34(5) (5), 2094 - 2102, English

  [Refereed]

  Scientific journal

• 月探査を見据えた月面帯電環境研究の現状と今後の展望

  三宅洋平, 中園仁, 早稲田卓, 宮城紀花

  Lead, Sep. 2024, 第67回「宇宙科学技術連合講演会」講演論文集, JSASS-2023, 40564, Japanese, JSASS-2023-40564-2R07.pdf, Preprint, No password, Domestic magazine

  Summary national conference

  添付ファイルのURL


• Lunar plasma and electrostatic environment: numerical approach and its future prospects

  Yohei Miyake, Jin Nakazono

  15 May 2023


• Implementation of Coupled Numerical Analysis of Magnetospheric Dynamics and Spacecraft Charging Phenomena via Code-To-Code Adapter (CoToCoA) Framework

  Yohei Miyake, Kazuya Nakazawa, Youhei Sunada, Takeshi Nanri, Keiichiro Fukazawa, Yuto Katoh

  Lead, Jul. 2022, 研究報告ハイパフォーマンスコンピューティング（HPC）, 2022-HPC-185(23) (23), 1 - 8, Japanese, Domestic magazine

  Summary national conference


• Feasibility study of Air Breathing Ion Engine by using plasma numerical analysis in discharge chamber

  白川遼, 臼井英之, 三宅洋平, 田川雅人, 山下裕介, 加納直起, 西山和孝

  2019, 宇宙科学技術連合講演会講演集(CD-ROM), 63rd


• Nonlinear Processes of Whistler-Mode Chorus Generation in the Earth's Inner Magnetosphere

  Yuto Kato, Yoshiharu Omura, Yohei Miyake, Hideyuki Usui, Hiroshi Nakashima

  Dec. 2018, Proc. AGU Fall Meeting 2018, English

  [Invited]


• 月縦孔・地下空洞探査に向けた月表層電磁気・ダスト環境の数値シミュレーション解析

  三宅 洋平, 西野 真木

  Lead, Oct. 2018, 第62回「宇宙科学技術連合講演会」講演論文集, JSASS-2018, 4702, Japanese, JSASS-2018-4702-3D05.pdf, Preprint, No password, Domestic magazine

  Summary national conference

  添付ファイルのURL


• Plasma Particle Simulation of ECR Plasma Generation in Air Breathing Ion Engine (ABIE)

  Jun. 2018, Proceedings of 15th Spacecraft Charging Technology Conference, 172: 1 - 5, English, SCTC2018_full-paper_172.pdf, Preprint, No password, International magazine

  Introduction international proceedings

  添付ファイルのURL


• Particle Simulation Analysis of Spacecraft Charging Processes in Plasma Wave Environment

  Takeshi Kiriyama, Yohei Miyake, Yuto Katoh, Hideyuki Usui

  Jun. 2018, Proceedings of 15th Spacecraft Charging Technology Conference, 140:1 - 6, English, SCTC2018_full-paper_140.pdf, Preprint, No password, International magazine

  Introduction international proceedings

  添付ファイルのURL


• 大気吸入型イオンエンジンにおけるECRプラズマ粒子シミュレーション

  白川遼, 臼井英之, 三宅洋平, 田川雅人, 西山和孝

  2018, 日本表面真空学会学術講演会講演要旨集, 2018


• 極域飛翔体周辺のプラズマじょう乱に関する粒子シミュレーション

  SASAKI Yukari, 臼井 英之, MIYAKE Yohei, MILOCH Wojciech

  Jan. 2018, 第14回「宇宙環境シンポジウム」講演論文集, JAXA-SP-17-006, 125 - 129, Japanese


• プラズマ波動環境下における人工衛星帯電現象の数値モデリング

  KIRIYAMA Takeshi, MIYAKE Yohei, 臼井 英之, KATOH Yuto

  Jan. 2018, 第14回「宇宙環境シンポジウム」講演論文集, JAXA-SP-17-006, 113 - 117, Japanese


• UZUME Project: Electrostatic Field Effects on Plasma and Dust Transport near Lunar Holes

  MIYAKE Yohei, NISHINO Masaki

  Lead, Oct. 2017, 第61回「宇宙科学技術連合講演会」講演論文集, JSASS-2017, 4054, Japanese, JSASS-2017-4054-1B14.pdf, Preprint, No password, Domestic magazine

  Summary national conference

  添付ファイルのURL


• Simulations on Dust Charging and Levitation near Lunar Surfaces

  MIYAKE Yohei, FUNAKI Yuji, NISHINO Masaki

  Feb. 2017, 第13回「宇宙環境シンポジウム」講演論文集, JAXA-SP-16-010, Japanese


• Current status and future challenges of air breathing ion engine

  安河内翼, 田川雅人, 横田久美子, 三宅洋平, 臼井英之, 西山和孝

  2017, 航空原動機・宇宙推進講演会講演論文集(CD-ROM), 57th


• Experimental study on Air Breathing Ion Engine associate with the numerically calculated electromagnetic wave distribution in the discharge chamber

  安河内 翼, 臼井 英之, 三宅 洋平, 福田 雅人, 横田 久美子, 田川 雅人

  日本航空宇宙学会, 06 Sep. 2016, 宇宙科学技術連合講演会講演集, 60, 3p, Japanese


• Challenges in use of Air Breathing Ion Engine in sub-low earth orbit environment

  安河内 翼, 臼井 英之, 三宅 洋平, 福田 雅人, 横田 久美子, 田川 雅人

  日本航空宇宙学会, 06 Sep. 2016, 宇宙科学技術連合講演会講演集, 60, 3p, Japanese


• Simulations on Electric Environment around Lunar Holes and Subsurface Caverns

  MIYAKE Yohei, NISHINO Masaki

  Lead, Sep. 2016, 第60回「宇宙科学技術連合講演会」講演論文集, JSASS-2016, 4045, Japanese, JSASS-2016-4045-1C13.pdf, Preprint, No password, Domestic magazine

  Summary national conference

  添付ファイルのURL


• Manycore-Aware Implementation of Parallel Plasma Particle-in-Cell Simulation Code

  三宅 洋平, 木倉 佳祐, 寸村 良樹, 中島 浩

  日本計算工学会, May 2016, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 21, 6p, Japanese


• Numerical Simulation of Neutral Particle Distribution at the Reflector of Air Breathing Ion Engine

  安河内 翼, 臼井 英之, 三宅 洋平

  日本航空宇宙学会, 07 Oct. 2015, 宇宙科学技術連合講演会講演集, 59, 4p, Japanese


• Plasma analysis for developing the air breathing ion thruster by 3D PIC numerical simulation

  川口 伸一郎, 臼井 英之, 三宅 洋平

  日本航空宇宙学会, 07 Oct. 2015, 宇宙科学技術連合講演会講演集, 59, 4p, Japanese


• 月縦孔プラズマ静電環境に関する大規模粒子シミュレーション

  三宅洋平, 西野真木

  Lead, Oct. 2015, 第59回「宇宙科学技術連合講演会」講演論文集, JSASS-2015, 4289, Japanese, JSASS-2015-4289-2D16.pdf, Preprint, No password, Domestic magazine

  Summary national conference

  添付ファイルのURL


• Optimization of Parallel Plasma Particle Simulations on MIC Architecture

  三宅 洋平, 木倉 佳祐, 臼井 英之

  日本計算工学会, Jun. 2015, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 20, 5p, Japanese


• Full Kinetic Simulation on Plasma Flow Response to a Meso-scale Magnetic Dipole

  Usui H, Umezawa M, Miyake Y, Matsumoto M, Moritaka T, Nishino M, Ieee

  2014, 2014 Xxxith Ursi General Assembly and Scientific Symposium (Ursi Gass)

  [Refereed]


• 大気吸入型イオンエンジン放電室内におけるプラズマ生成シミュレーション

  本山 貴仁, 臼井 英之, 三宅 洋平, 川口 伸一郎, 横田 久美子, 田川 雅人

  Abbreviated

  JAXA, Dec. 2013, 第10回宇宙環境シンポジウム, JAXA-SP(JAXA-SP-13-016) (JAXA-SP-13-016), 61 - 64, Japanese


• Microwave plasma simulation for the development of air breathing ion engine

  Takahito Motoyama, Hideyuki Usui, Yohei Miyake, Kumiko Yokota, Masahito Tagawa

  Abbreviated

  JSASS, Jun. 2013, The 29th International Space Technology and Sciences, USB, English


• Job-level Parallel Executions for Satisfying Distributed Constraints

  安部 達也, 平石 拓, 三宅 洋平, 岩下 武史, 中島 浩

  分散制約充足問題を分散並列計算環境で解くにあたり，ジョブを処理の単位とする分散並列処理 （ジョブ並列） に特化したジョブ並列スクリプト言語 Xcrypt で処理を記述することにより，実際の分散並列計算環境であるところの，いわゆるスーパーコンピュータを利用する方法を紹介する．さらに，Xcrypt の遠隔ジョブ投入機構を利用することにより，制約が遠隔の計算機に分散された状態からの制約充足問題，つまり，真の意味での分散制約充足問題を簡便に取り扱うことができることを示す．We introduce a method of parallel executions based on the job unit (job-level parallel executions) for solving distributed constraint satisfaction problems (DCSPs) in parallel and distributed computation environments, the so-called today's many supercomputers. Throughout introducing the method we use the job-level parallel script language Xcrypt, specific to job-level parallel executions. We also show that Xcrypt provides us with a feature of submitting remotely jobs for solving realistic DCSPs (under the circumstances that constraints are truely distributed in separate computers).

  20 Jul. 2011, 研究報告ハイパフォーマンスコンピューティング（HPC）, 2011(59) (59), 1 - 8, Japanese


• ブロック化赤－黒順序付け法による並列マルチグリッドポアソンソルバの開発とその性能評価

  河合直聡, 岩下武史, 中島浩, 三宅洋平

  18 May 2011, 先進的計算基盤システムシンポジウム論文集, 2011, 226 - 226, Japanese


• A Parallelization of Particle-Fluid Hybrid Plasma Simulation with the OhHelp Load Balancer

  AKIYAMA JUNTA, SHOJI MASAFUMI, MIYAKE YOHEI, OMURA YOSHIHARU, NAKASHIMA HIROSHI

  本論文では，粒子・流体ハイブリッドプラズマシミュレーションの，負荷分散技法 OhHelp を用いた並列化について述べる．すでに OhHelp を適用して良好な結果が得られている全粒子シミュレーションに比べ，ハイブリッドシミュレーションは電磁場の計算負荷が相対的に大きいため，計算と通信のバランスを大幅に見直した実装を行った．特に Cyclic Leapfrog 法による電磁場計算に関する，通信回数削減と計算量増加のトレードオフポイントを見出すことが可能な設計とした．また実用的なシミュレーションに不可欠な，スナップショットやダンプファイルの出力方式も検討し，並列 I/O を用いて並列性能と利便性の両立を図る設計・実装を行った．性能評価の結果，256 プロセスでの実行で 241-456 倍の台数効果が得られること，電磁場計算では計算量増加を抑えることが効果的であること，およびスナップショットと Weak/Strong Scalability との関係が明らかになった．This paper describes a parallel implementation of particle-fluid hybrid plasma simulation with our load balancing method OhHelp. In hybrid simulation, the cost to simulate the progress of electromagnetic field is more significant than that in full-particle simulation whose OhHelp'ed parallelization has already been proved efficient. Thus in this work we revisited the issue of the cost balance between computation and communication, especially for Cyclic Leapfrog method and the trade-off between reducing the number of communications and increasing computational amount. We also designed and implemented parallel-I/O for snapshot and dump, being essential for practical use of our simulator, to reconcile parallel performance and convenience of users. Our evaluation exhibited that the speedup with 256 process is 241- to 456-fold and that suppressing computational cost is the first priority in Cyclic Leapfrog. We also obtained valuable insights about the relationship between weak/strong scalability and snapshot frequency.

  一般社団法人情報処理学会, 15 Feb. 2010, 研究報告ハイパフォーマンスコンピューティング（HPC）, 2010(8) (8), 1 - 11, Japanese


• Performance Evaluation of OhHelp'ed 3D Particle-in-Cell Simulation

  NAKASHIMA HIROSHI, MIYAKE YOHEI, USUI HIDEYUKI, OMURA YOSHIHARU

  We proposed an efficient and scalable load balancing method named OhHelp for Particle-in-Cell (PIC) simulations. This method simply and equally partitions the space domain, in which charged particles are distributed nonuniformly in general, so that each computation node works on each partitioned primary subdomain. Load imbalance problem caused by the nonuniformity of the particle distribution is solved by making every but one node also work on another subdomain where particles densely populate as its secondary subdomain together with a part of particles in it. We applied the OhHelp method to a production level full-3D PIC simulator for space plasma and evaluated its performance on our T2K Open Supercomputer. As a result, we confirmed our simulator is not only efficient showing 150-190 speedup with 256 CPU cores compared to the sequential execution of a reference simulator, but also scalable in terms of both the space domain size and the number of particles as the break down of execution times evidences.

  Information Processing Society of Japan (IPSJ), 19 Feb. 2009, IPSJ SIG Notes, 2009(14) (14), 1 - 6, Japanese


• Particle-In-Cell simulations on antenna characteristics in space plasma

  H. Usui, N. Nakamura, Y. Miyake, H. Kojima, H. Matsumoto, Y. Omura

  2004, 2004 Asia-Pacific Radio Science Conference - Proceedings, 588 - 591, English

  [Refereed]

• 月面近傍におけるラングミュアプローブ特性の数値実験

  谷口泰斗, 三宅洋平, 中園仁, 深澤伊吹, 臼井英之, 栗田怜, 小嶋浩嗣

  2024年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2025, Japanese, Japan, Domestic conference

  Oral presentation


• 水星磁気圏内部における太陽風イオンダイナミクスの3次元シミュレーション解析

  高村彪丸, 臼井英之, 三宅洋平, 松本正晴

  2024年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2025, Japanese, Japan, Domestic conference

  Oral presentation


• 上空－表層結合プラズマ計算手法に基づく月面帯電シミュレータの開発

  酒谷龍生, 三宅洋平, 臼井英之

  2024年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2025, Japanese, Japan, Domestic conference

  Oral presentation


• 月面帯電環境の計測と評価

  三宅洋平, 三好由純, 原田裕己, 西野真木, 栗田怜, 笠原慧, 臼井英之, 永松愛子, 奥村哲平, 豊田和弘, 中村紗都子, 月面静電気・放射線調査チーム

  第26回惑星圏シンポジウム（SPS2025）, Mar. 2025, Japanese, Japan, Domestic conference

  [Invited]

  Invited oral presentation


• 地球磁気圏－人工衛星環境連成解析に向けた衛星帯電計算の時間方向並列化の検討

  田中唯逸, 三宅洋平, 南里豪志, 深沢圭一郎, 加藤雄人

  第197回ハイパフォーマンスコンピューティング研究発表会, Dec. 2024, Japanese, Japan, Domestic conference

  Oral presentation


• Surface charging characteristics of cavities formed on an irregular lunar surface: Dependence on cavity size

  Jin Nakazono, Yohei Miyake

  AGU Annual Meeting 2024, Dec. 2024, English, United States, International conference

  Poster presentation


• Anticipated Micro-scale Electrostatic Structures formed on the Rough Lunar Surface exposed to Space Plasma

  Yohei Miyake, Jin Nakazono, Jan Deca

  AGU Annual Meeting 2024, Dec. 2024, English, United States, International conference, Co-authored internationally

  Oral presentation


• 帯電・分極した固体天体レゴリスの動力学シミュレーションに向けた数値技術開発

  三宅 洋平, 高橋 昇大, 榊原 大和, 中園 仁

  地球電磁気・地球惑星圏学会2024年秋季年会, Nov. 2024, Japanese, Japan, Domestic conference

  Poster presentation


• 高並列プラズマ計算機実験で解き明かす月表層静電気環境の新描像

  三宅洋平

  第11回「富岳」を中核とするHPCIシステム利用研究課題成果報告会, Oct. 2024, Japanese, Japan, Domestic conference

  Poster presentation


• Multi-scale Electrostatic Structures on the Lunar Surface

  Jin Nakazono, Yohei Miyake

  2nd Lunar Plasma Interdisciplinary Network (LuPIN-2), Sep. 2024, English, Sweden, International conference

  Oral presentation


• PIC Simulations: Tutorial

  Yohei Miyake, Yoshiharu Omura

  15th International Symposium for Space Simulations (ISSS-15), Aug. 2024, English, Germany, International conference

  [Invited]

  Public discourse


• 太陽風プラズマ条件下での月面空隙部帯電特性に関する数値シミュレーション

  中園仁, 三宅洋平

  第18回宇宙環境シンポジウム, Jul. 2024, Japanese, Japan, Domestic conference

  Oral presentation


• マルチスケール宇宙プラズマ連成シミュレーションの研究

  三宅洋平

  JHPCN学際大規模情報基盤共同利用・共同研究拠点第16回シンポジウム, Jul. 2024, Japanese, Japan, Domestic conference

  Oral presentation


• Micro-scale Electrostatic Structures formed on the Rough Surfaces of the Moon

  Yohei Miyake, Jin Nakazono, Yoshizumi Miyoshi, Yuki Harada, Masaki N Nishino, Satoshi Kurita, Satoshi Kasahara, Satoko Nakamura, Aiko Nagamatsu, Hideyuki Usui

  17th Spacecraft Charging Technology Conference (SCTC), Jun. 2024, English, France, International conference

  Oral presentation


• 水星磁気圏内部におけるイオンダイナミクスに関するハイブリッド粒子シミュレーション

  高村彪丸, 臼井英之, 三宅洋平, 松本正晴

  日本地球惑星科学連合2024年大会, May 2024, Japanese, Japan, Domestic conference

  Poster presentation


• Particle-in-Cell Simulations on Interferometry Technique Using Monopole Electric Field Sensors

  深澤伊吹, 三宅洋平, 臼井英之, 栗田怜, 小嶋浩嗣

  日本地球惑星科学連合2024年大会, May 2024, Japanese, Japan, Domestic conference

  Poster presentation


• 惑星上層大気モンテカルロ直接法シミュレーションにおける動的負荷分散技法の検討

  釜江祥史, 三宅洋平, 寺田直樹, 寺田香織

  日本地球惑星科学連合2024年大会, May 2024, Japanese, Japan, Domestic conference

  Poster presentation


• Photoelectron dynamics and associated charging characteristics evolved on the rough surfaces of the Moon

  中園仁, 三宅洋平

  日本地球惑星科学連合2024年大会, May 2024, Japanese, Japan, Domestic conference

  Oral presentation


• コード間結合フレームワークCoToCoAを用いた宇宙天気－人工衛星帯電連成解析手法およびIn-situ可視化機能の開発

  三宅洋平, 南里豪志, 深沢圭一郎, 加藤雄人, 周靖得, 田中唯逸

  先駆的科学計算フォーラム2024, May 2024, Japanese, Japan, Domestic conference

  Oral presentation


• ⼩型天体・宇宙プラズマ相互作⽤の数値シミュレーション研究

  三宅洋平

  2023年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2024, Japanese, Japan, Domestic conference

  Oral presentation


• PIC Simulations for Analyzing Interferometry Technique Using a Single Spacecraft

  深澤伊吹, 三宅洋平, 臼井英之, 草地恒史郎, 栗田怜, 小嶋浩嗣

  2023年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2024, Japanese, Japan, Domestic conference

  Oral presentation


• プラズマ波動観測⽤アンテナの低周波域特性に関する粒⼦シミュレーション

  草地恒史郎, 三宅洋平, 臼井英之

  2023年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2024, Japanese, Japan, Domestic conference

  Oral presentation


• 火星上層大気DSMCシミュレーション向け高性能計算技法の開発

  釜江祥史, 三宅洋平, 寺田直樹

  第25回惑星圏研究会(SPS2024), Feb. 2024, Japanese, Japan, Domestic conference

  Oral presentation


• 太陽風に曝された月面凹凸部に生じる局所帯電の空間スケール・形状依存性

  中園仁, 三宅洋平

  第25回惑星圏研究会(SPS2024), Feb. 2024, Japanese, Japan, Domestic conference

  Oral presentation


• 月表面構造がもたらす太陽風プラズマ駆動の帯電特性に関する粒子シミュレーション

  中園 仁, 三宅 洋平

  STEシミュレーション研究会：計算科学とデータ科学の融合に向けて, Dec. 2023, Japanese, Domestic conference

  Oral presentation


• 人工衛星帯電シミュレーションの時間方向並列化の基礎検討

  田中 唯逸, 三宅 洋平, 南里 豪志, 深沢 圭一郎, 加藤 雄人

  STEシミュレーション研究会：計算科学とデータ科学の融合に向けて, Dec. 2023, Japanese, Domestic conference

  Oral presentation


• Numerical Study on Long-Range Influences of Space Plasma Interactions with Airless Planetary Bodies

  Yohei Miyake

  AGU Annual Meeting 2023, Dec. 2023, English, United States, International conference

  Poster presentation


• Solar Wind Driven Localized and Strong Electric Charging of Irregular Surfaces on the Moon

  Jin Nakazono, Yohei Miyake

  AGU Annual Meeting 2023, Dec. 2023, English, International conference

  Poster presentation


• 月面に設置された人工構造物の帯電特性に関するプラズマ粒子シミュレーショ ン評価

  宮城 紀花, 中園 仁, 早稲田 卓, 三宅 洋平

  第67回宇宙科学技術連合講演会, Oct. 2023, Japanese, Japan, Domestic conference

  Poster presentation


• 月探査を見据えた月面帯電環境研究の現状と今後の展望

  三宅 洋平, 中園 仁, 早稲田 卓, 宮城 紀花

  第67回宇宙科学技術連合講演会, Oct. 2023, Japanese, Domestic conference

  Oral presentation


• 太陽風プラズマ駆動の月微小空洞の局所的な表面帯電による静電的イオン散乱

  中園仁, 三宅洋平

  地球電磁気・地球惑星圏学会2023年秋季年会, Sep. 2023, Japanese, Japan, Domestic conference

  Oral presentation


• 宇宙プラズマ中の低域混成周波数付近におけるアンテナインピーダンス特性に関する粒子シミュレーション

  草地恒史郎, 三宅洋平, 臼井英之, 小嶋浩嗣, 栗田怜, 深澤伊吹

  地球電磁気・地球惑星圏学会2023年秋季年会, Sep. 2023, Japanese, Japan, Domestic conference

  Oral presentation


• 月局所磁化領域周辺の静電プラズマ環境に関する粒子シミュレーション

  早稲田卓, 三宅洋平, 中園仁

  地球電磁気・地球惑星圏学会2023年秋季年会, Sep. 2023, Japanese, Japan, Domestic conference

  Oral presentation


• コード間結合フレームワークに基づく宇宙環境変動－衛星帯電現象連成解析プラットフォームの開発

  三宅洋平, 砂田洋平, 田中唯逸, 深沢圭一郎, 南里豪志, 加藤雄人

  地球電磁気・地球惑星圏学会2023年秋季年会, Sep. 2023, Japanese, Japan, Domestic conference

  Poster presentation


• Role of Numerical Studies in the Electrostatics of the Moon

  Yohei Miyake

  LuPIN-1: Lunar Plasma Interdisciplinary Network, Sep. 2023, English, International conference

  [Invited]

  Invited oral presentation


• Numerical Analysis of Intense Surface Charging inside Deep Cavities on the Moon

  Jin Nakazono, Yohei Miyake

  35th URSI General Assembly and Scientific Symposium (URSI GASS 2023), Aug. 2023, English, International conference

  Oral presentation


• Computer Simulations on Single-Spacecraft Interferometry Technique Using Monopole Electric Field Sensors

  Ibuki Fukasawa, Yohei Miyake, Hideyuki Usui, Koshiro Kusachi, Satoshi Kurita, Hirotsugu Kojima

  35th URSI General Assembly and Scientific Symposium (URSI GASS 2023), Aug. 2023, English, International conference

  Oral presentation


• Cassini’s floating potential in Titan’s ionosphere: 3-D Particle-In-Cell Simulations

  Zeqi Zhang, Ravindra Desai, Oleg Shebanits, Yohei Miyake, HIdeyuki Usui

  35th URSI General Assembly and Scientific Symposium (URSI GASS 2023), Aug. 2023, English, International conference, Co-authored internationally

  Poster presentation


• Particle Simulation on Antenna Characteristics at around the Lower-Hybrid Resonance Frequency in Space Plasma

  Kusachi Koshiro, Yohei Miyake, Hideyuki Usui, Hirotsugu Kojima, Satoshi Kurita, Ibuki Fukasawa

  35th URSI General Assembly and Scientific Symposium (URSI GASS 2023), Aug. 2023, English, International conference

  Poster presentation


• Computer simulations on measurements of space potentials on the Earth’s moon surface

  中島 稜大, 三宅 洋平, 臼井 英之, 栗田 怜, 小嶋 浩嗣

  日本地球惑星科学連合2023年大会, May 2023, Japanese

  Poster presentation


• 昼側月面におけるオージェ電子分光の実現可能性の研究

  加藤 正久, 原田 裕己, 松本 徹, Shaosui Xu, Andrew Poppe, Jasper Halekas, 三宅 洋平, 臼井 英之, 西野 真木

  日本地球惑星科学連合2023年大会, May 2023, Japanese

  Poster presentation


• 太陽風による月面空洞表面帯電の上流プラズマ条件と空洞形状への依存性

  中園 仁, 三宅 洋平

  日本地球惑星科学連合2023年大会, May 2023, Japanese

  Oral presentation


• 低域混成周波数帯のアンテナインピーダンス共鳴特性に関する数値シミュレーション

  草地 恒史郎, 三宅 洋平, 臼井 英之, 深澤 伊吹, 栗田 怜, 小嶋 浩嗣

  日本地球惑星科学連合2023年大会, May 2023, Japanese

  Poster presentation


• 彗星高密度プラズマの表面じょう乱に関する粒子シミュレーション

  寺田 大樹, 三宅 洋平, 臼井 英之

  日本地球惑星科学連合2023年大会, May 2023, Japanese

  Poster presentation


• Particle-In-Cell Simulations of Interferometry Observations by Single Spacecraft

  深澤 伊吹, 三宅 洋平, 臼井 英之, 草地 恒史郎, 栗田 怜, 小嶋 浩嗣

  日本地球惑星科学連合2023年大会, May 2023, Japanese

  Oral presentation


• Lunar plasma and electrostatic environment: numerical approach and its future prospects

  Miyake, Y, Nakazono, J

  EGU General Assembly 2023, Apr. 2023, English, Austria, International conference

  Poster presentation


• Numerical Study of Surface Charging Process on Airless Planetary Bodies

  Yohei Miyake

  8th MMX/SSG-SST meeting, Apr. 2023, English, International conference

  [Invited]

  Invited oral presentation


• 磁気圏環境変動を考慮した人工衛星帯電解析手法の開発

  砂田 洋平, 田中 唯逸, 三宅 洋平, 深沢 圭一郎, 南里 豪志, 加藤 雄人

  2023年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2023, Japanese

  Oral presentation


• 低温プラズマで被覆された金属物体の電波散乱特性の数値シミュレーション

  高木 淳也, 三宅 洋平, 臼井 英之, 賀谷 信幸

  2023年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2023, Japanese

  Oral presentation


• 宇宙プラズマ中における電界センサー特性に関するPICシミュレーション

  深澤 伊吹, 三宅 洋平, 臼井 英之, 草地 恒史郎, 栗田 怜, 小嶋 浩嗣

  2023年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2023, Japanese

  Oral presentation


• 月空洞表面における太陽風駆動の正帯電過程に関する粒子シミュレーション

  中園仁, 三宅洋平

  第24回惑星圏研究会(SPS2023), Feb. 2023, Japanese

  Poster presentation


• Estimating the spacecraft potential of Comet Interceptor - simulation results and implications for plasma measurements

  Sofia Bergman, Satoshi Kasahara, Yohei Miyake

  第24回惑星圏研究会(SPS2023), Feb. 2023, English, Co-authored internationally

  Poster presentation


• 昼側月面由来の光電子・オージェ電子のエネルギースペクトルに関する研究

  加藤正久, 原田裕己, Shaosui Xu, Andrew R. Poppe, Jasper S. Halekas, 三宅洋平, 臼井英之, 西野真木, 松本徹

  第24回惑星圏研究会(SPS2023), Feb. 2023, Japanese

  Oral presentation


• 粒子シミュレーションによる水星磁気圏イオンダイナミクス解析

  上本祥貴, 臼井英之, 三宅洋平, 松本正晴

  第24回惑星圏研究会(SPS2023), Feb. 2023, Japanese

  Poster presentation


• Developing an emission model of photoelectrons and Auger electrons from the sunlit lunar surface and its application to evaluation of the lunar electrostatic environment

  Kato, Masahisa, Harada, Yuki, Xu, Shaosui, Poppe, Andrew R, Halekas, Jasper S, Miyake, Yohei, Usui, Hideyuki, Nishino, Masaki N, Matsumoto, Toru

  AGU Fall Meeting 2022, Dec. 2022, English, International conference, Co-authored internationally

  Poster presentation


• Numerical Simulations on Solar-Wind-Driven Surface Charging within Deep Cavities on the Moon

  Jin Nakazono, Yohei Miyake

  AGU Fall Meeting 2022, Dec. 2022, English

  Poster presentation


• Development of the Space-Weather-Aware Satellite Charging Analysis Platform Based on the Numerical Code Coupling Framework

  Yohei Miyake, Keishi Kawaguchi, Kazuya Nakazawa, Youhei Sunada, Keiichiro Fukazawa, Takaeshi Nanri, Yuto Katoh

  AGU Fall Meeting 2022, Dec. 2022, English

  Poster presentation


• 人類の活動の場としての月面環境 ～月ダストに関わる学理を中心に～

  三宅洋平

  第16回生存圏フォーラム特別講演会「宇宙で持続可能性を考える」, Nov. 2022, Japanese

  [Invited]

  Public discourse


• コード間結合フレームワークを用いた人工衛星帯電解析の技術基盤開発

  砂田洋平, 三宅洋平, 中澤和也, 深沢圭一郎, 南里豪志, 加藤雄人

  地球電磁気・地球惑星圏学会第152回総会・講演会, Nov. 2022, Japanese

  Poster presentation


• Particle Simulations on Characteristics of Electric Field Sensors applied to the Interferometry technique in Space Plasmas

  深澤伊吹, 三宅洋平, 臼井英之, 草地恒史郎, 栗田怜, 小嶋浩嗣

  地球電磁気・地球惑星圏学会第152回総会・講演会, Nov. 2022, Japanese

  Poster presentation


• 月面の凹凸に起因する非従来型帯電現象に関するプラズマ粒子シミュレーション

  中園仁, 三宅洋平

  地球電磁気・地球惑星圏学会第152回総会・講演会, Nov. 2022, Japanese

  Oral presentation


• 月面からの光電子とオージェ電子放出モデルの開発

  加藤正久, 原田裕己, Xu Shaosui, Poppe Andrew, Halekas Jasper S, 三宅洋平, 臼井英之, 西野真木, 松本徹

  地球電磁気・地球惑星圏学会第152回総会・講演会, Nov. 2022, Japanese

  Oral presentation


• 水星磁気圏昼間側擾乱に関する粒子シミュレーション

  上本祥貴, 臼井英之, 三宅洋平, 松本正晴

  地球電磁気・地球惑星圏学会第152回総会・講演会, Nov. 2022, Japanese

  Poster presentation


• 月面近傍プラズマ・静電気環境研究の最近の動向と今後の展望

  三宅洋平, 中園仁

  地球電磁気・地球惑星圏学会第152回総会・講演会, Nov. 2022, Japanese

  Oral presentation


• Particle Simulations on Antenna Characteristics in Space Plasma near the Lower-Hybrid Resonance Frequency

  Koshiro Kusachi, Yohei Miyake, Hideyuki Usui, Hirotsugu Kojima, Satoshi Kurita, Ibuki Fukasawa

  2022URSI-Japan Radio Science Meeting(URSI-JRSM 2022), Sep. 2022, English

  Poster presentation


• Analysis of Radio Wave Scattering by Metal Objects Covered by Plasma

  Junya Takagi, Yohei Miyake, Hideyuki Usui, Nobuyuki Kaya

  2022URSI-Japan Radio Science Meeting(URSI-JRSM 2022), Sep. 2022, English

  Poster presentation


• コード結合フレームワークCoToCoAによる磁気圏MHD－人工衛星帯電連成シミュレーションの実現

  三宅 洋平, 中澤 和也, 砂田 洋平, 南里 豪志, 深沢 圭一郎, 加藤 雄人

  第185回ハイパフォーマンスコンピューティング研究発表会（SWoPP2022）, Jul. 2022, Japanese

  Oral presentation


• 電波COE「電波利活用強靭化に向けた周波数創造技術に関する研究開発及び人材育成プログラム」共同型研究開発進捗報告：技術課題⑤

  三宅洋平, 賀谷信幸, 仁田功一

  第３回電波利活用強靭化に向けた電波COEシンポジウム, Jun. 2022, Japanese

  Oral presentation


• 地球磁気圏尾部での月面から放出されるAuger電子と光電子ビームの特性

  加藤 正久, 原田 裕己, Shaosui Xu, Andrew Poppe, Jasper Halekas, 三宅 洋平, 臼井 英之, 西野 真木

  日本地球惑星科学連合2022年大会, May 2022, Japanese, Japan, Domestic conference, Co-authored internationally

  Poster presentation


• 表面形状に依存した非一様月面帯電に関する粒子シミュレーション

  中園 仁, 三宅 洋平

  日本地球惑星科学連合2022年大会, May 2022, Japanese, Japan, Domestic conference

  Oral presentation


• 宇宙プラズマ中の低周波域アンテナ特性に関する粒子シミュレーション

  草地 恒史郎, 三宅 洋平, 臼井 英之, 小嶋 浩嗣, 深澤 伊吹, 栗田 怜

  日本地球惑星科学連合2022年大会, May 2022, Japanese, Japan, Domestic conference

  Oral presentation


• Computer Simulation on Antenna Impedance of Electric Field Sensors in Magnetized Plasmas

  深澤 伊吹, 三宅 洋平, 臼井 英之, 草地 恒史郎, 栗田 怜, 小嶋 浩嗣

  日本地球惑星科学連合2022年大会, May 2022, Japanese, Japan, Domestic conference

  Oral presentation


• 宇宙プラズマ中における電界センサー特性に関する計算機シミュレーション

  深澤伊吹, 三宅洋平, 臼井英之, 栗田怜, 小嶋浩嗣

  2021年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2022, Japanese

  Oral presentation


• 粒子シミュレーションによる微粒子後方プラズマウェイクの構造解析

  室賀健太, 三宅洋平, 臼井英之

  2021年度RISH電波科学計算機実験(KDK)シンポジウム, Mar. 2022, Japanese

  Oral presentation


• Simulation Study on Radio Wave Scattering by Small Objects covered with a Charged Particle Layer

  Yohei Miyake, Junya Takagi, Nobuyuki Kaya

  33rd International Symposium on Space Technology and Science, Mar. 2022, English

  Poster presentation


• 表面形状に依存した月面帯電非一様性の数値シミュレーション研究

  中園仁, 三宅洋平

  第23回惑星圏研究会(SPS2022), Japanese

  Oral presentation


• Code-To-Code Adapter(CoToCoA)ライブラリの開発と惑星電磁圏連成計算研究について

  加藤雄人, 深沢圭一郎, 南里豪志, 三宅洋平

  核融合科学研究所一般共同研究「先端的コンピュータ技術の利活用」シミュレーション技法に関する研究会, Jan. 2022, Japanese

  [Invited]

  Invited oral presentation


• A Decade of Effort in HPC toward Efficient Plasma Particle Simulations

  Yohei Miyake, Hiroshi Nakashima, Keisuke Kikura, Yoshiki Sunmura, Takuya Saeki, Hikaru Tamarushima

  核融合科学研究所一般共同研究「先端的コンピュータ技術の利活用」シミュレーション技法に関する研究会, Jan. 2022, Japanese

  Oral presentation


• CoToCoA: A Communication-Efficient Framework for Coupling Programs

  Takeshi Nanri, Yuto Katoh, Keiichiro Fukazawa, Yohei Miyake, Kazuya Nakazawa

  HPCAsia2022, English

  Poster presentation


• A Decade of Effort in HPC toward Realistic Scale Spacecraft-Environment Interaction Simulations

  Yohei Miyake

  8th International Workshop on Large-scale HPC Application Modernization, Nov. 2021, English

  [Invited]

  Keynote oral presentation


• 太陽風プラズマによる月面帯電現象の表面形状への依存性

  中園仁, 三宅洋平, 臼井英之

  地球電磁気・地球惑星圏学会第150回総会及び講演会, Nov. 2021, Japanese

  Oral presentation


• 太陽地球惑星系科学分野におけるシミュレーション研究の将来構想

  三宅洋平, 松本洋介, 太陽地球惑星系分科会科学シミュレーション

  地球電磁気・地球惑星圏学会第150回総会及び講演会, Nov. 2021, Japanese

  [Invited]

  Invited oral presentation


• 宇宙におけるプラズマ-固体境界層の理工学研究

  三宅 洋平

  宇宙地球惑星科学若手会 夏の学校2021, Sep. 2021, Japanese

  [Invited]


• STP数値計算コードにおける連成計算フレームワークCoToCoAの実装

  深沢圭一郎, 加藤雄人, 三宅洋平, 南里豪志

  STEシミュレーション研究会：太陽系シミュレーション研究の新展開, Japanese

  Oral presentation


• Numerical Simulations on Surface Charging Properties of LunarSurface Cavities

  中園 仁, 三宅 洋平, 臼井 英之

  JpGU Meeting 2021, Jun. 2021, Japanese

  Oral presentation


• Numerical Study on Radio Wave Scattering by Obstacles covered byCharged Particle Layer

  三宅 洋平, 高木 淳也, 臼井 英之

  JpGU Meeting 2021, Jun. 2021, Japanese

  Poster presentation


• 宇宙デブリの電波散乱特性に関するプラズマ粒子シミュレーション

  高木淳也, 三宅洋平, 臼井英之

  STEシミュレーション研究会・KDKシンポジウム合同研究会, Mar. 2021, Japanese

  Oral presentation


• 人工天体（宇宙機、衛星）：「固い境界」周辺のプラズマ物理

  三宅洋平, 臼井英之

  太陽地球惑星兼の研究領域のロードマップ作成に向けた研究会, Mar. 2021, Japanese

  [Invited]

  Nominated symposium


• 水星磁気圏境界面の太陽風依存性に関するハイブリッド粒子シ ミュレーション

  元田尚志, 臼井英之, 三宅洋平, 松本正晴

  第22回惑星圏研究会, Feb. 2021, Japanese

  Poster presentation


• The Surface Charging Processes of Airless Planetary Bodies

  三宅洋平, 中園仁, 臼井英之

  第22回惑星圏研究会, Feb. 2021, Japanese

  [Invited]

  Invited oral presentation


• Electric Field Sensor Impedance in Magnetized Plasma by Particle-in-Cell Simulation

  深澤伊吹, 小嶋浩嗣, 三宅洋平, 臼井英之, 栗田怜

  第147回地球電磁気・地球惑星圏学会, Nov. 2020, Japanese

  Oral presentation


• Full PIC Simulations of the Surface Charging on the Nightside of Phobos: The Effect of Surface-Plasma Interaction

  田邉正樹, 寺田直樹, 三宅洋平, 臼井英之

  第147回地球電磁気・地球惑星圏学会, Nov. 2020, Japanese

  Oral presentation


• 宇宙環境の時間変動を考慮し た人工衛星帯電数値解析手法の開発

  川口慧士, 三宅洋平, 深沢圭一郎, 臼井英之

  第147回地球電磁気・地球惑星圏学会, Nov. 2020, Japanese

  Oral presentation


• 弱磁化宇宙プラズマ中の固体物体周辺の静電構造に関する粒子シミュレーション

  三宅洋平, Wojciech Miloch, Solveig Kjus, Hans Pecseli

  第147回地球電磁気・地球惑星圏学会, Nov. 2020, Japanese

  Oral presentation


• イオン電流が駆動する表面帯電現象の物理機構について

  三宅洋平

  第17回宇宙環境シンポジウム, Oct. 2020, Japanese

  Oral presentation


• 粒子モデルプラズマ運動論シミュレーションの高効率計算技法

  三宅洋平

  プラズマシミュレータシンポジウム2020, Sep. 2020, Japanese

  [Invited]

  Invited oral presentation


• Design of Electric Field Measurements in the Future Mission FACTORS Targeting Transverse Ion Acceleration in the Terrestrial Polar Magnetosphere

  Kojima, H, N. Kitamura, K. Shibuya, I. Fukasawa, Y. Kasaba, M. Hirahara, Y. Kasahara, Y. Miyake, H. Usui, K. Asamura, Y. Saito

  JpGU-AGU Joint Meeting 2020, Jul. 2020, English


• Development of Generic Plasma Irradiation System for Modeling of Space Weathering at Solar System Bodies

  Kimura, T, Y. Nakauchi, J. Kimura, G. Murakami, N. Terada, H. Usui, M.N. Nishino, S. Yokota, Y. Miyake, K. Yoshioka

  JpGU-AGU Joint Meeting 2020, Jul. 2020, English


• フォボス夜側表面における帯電現象のPICシミュレーション解析

  田邉正樹, 寺田直樹, 三宅洋平, 臼井英之

  日本地球惑星科学連合2020年大会, Jul. 2020, Japanese

  Oral presentation


• Computer Simulation of Electric Field Sensor in Space Plasma

  Ibuki Fukasawa, Hirotsugu Kojima, Yohei Miyake, Hideyuki Usui

  JpGU-AGU Joint Meeting 2020, Jul. 2020, English

  Poster presentation


• フォボス夜側ウェイク形成の表面帯電への寄与

  田邉正樹, 寺田直樹, 臼井英之, 三宅洋平

  第7回衛星系研究会, Feb. 2020, Japanese

  Oral presentation


• 2D Particle-In-Cell Calculations of Non-Neutral Plasma Structure near the Phobos Plasma Wake Region and Its Effect on the Surface Charging

  Masaki Tanabe, Naoki Terada, Hideyuki Usui, Yohei Miyake

  Symposium on Planetary Sciences, Feb. 2020, English

  Poster presentation


• Recent Activities of Solid Body-Plasma Interaction Simulations

  Yohei Miyake, Masaki N Nishino, Yuki Harada, Hideyuki Usui

  Symposium on Planetary Sciences, Feb. 2020, English

  Poster presentation


• Modeling of Spacecraft Charging Processes in Time-varying Space Environment

  Yohei Miyake, Keishi Kawaguchi, Yuto Katoh, Hideyuki Usui

  The 4th PSTEP International Symposium (PSTEP-4), Jan. 2020, English

  Poster presentation


• Simulations of Electrostatic Structure near Spacecraft in a Weakly-Magnetized Plasma

  Yohei Miyake, Wojciech J Miloch, Hans Pecseli

  AGU Fall Meeting 2019, Dec. 2019, English

  Poster presentation


• 大気吸入型イオンエンジンにおけるプラズマ数値解析による成立性の検討

  白川遼, 山下裕介, 三宅洋平, 臼井英之, 田川雅人, 加納直起, 西山和孝

  第16回宇宙環境シンポジウム, Nov. 2019

  Oral presentation


• Numerical Simulation of Charged Particle in Cathodic Arc Plasma

  Risa Yamashita, Hideyuki Usui, Yohei Miyake, Kenji Yamamoto

  International Thin Film Conference (TACT), Nov. 2019, English

  Poster presentation


• 電子反射法を用いた太陽風中での月面磁場強度推定

  川口友暉, 原田裕己, 斎藤義文, 横田勝一郎, 西野真木, 臼井英之, 三宅洋平, 高橋太, 清水久芳

  第146回地球電磁気・地球惑星圏学会, Oct. 2019

  Oral presentation


• 太陽風と火星起源イオンのフォボス表面への 衝突の数値実験

  田邉正樹, 寺田直樹, 三宅洋平, 臼井英之

  第146回地球電磁気・地球惑星圏学会, Oct. 2019

  Oral presentation


• 衛星帯電緩和ビームによるプローブ電場計測干渉に関する粒子シミュレーション

  岡崎ほのか, 三宅洋平, 臼井英之

  第146回地球電磁気・地球惑星圏学会, Oct. 2019

  Oral presentation


• フォボス後方のウェイク形成と表面帯電のPICシミュレーション解析

  田邉正樹, 寺田直樹, 三宅洋平, 臼井英之

  STEシミュレーション研究会, Sep. 2019, Japanese

  Oral presentation


• 電子反射法を用いた太陽風中での月面磁場強度推定

  川口友暉, 原田裕己, 斎藤義文, 横田勝一郎, 西野真木, 臼井英之, 三宅洋平, 綱川秀夫, 加藤大羽

  日本地球惑星科学連合2019年大会, May 2019, Japanese

  Oral presentation


• プローブ電界計測に対する衛星帯電・シース・ウェイクの影響について

  三宅 洋平

  第11回ERGサイエンス会議, Mar. 2019, Japanese, Nagoya, Domestic conference

  Oral presentation


• Numerical simulation on plasma dynamics at the dayside magnetopause in a small-scale magnetosphere

  Satoki Oki, Usui Hideyuki, Yohei Miyake, Naoki Terada, Kanako Seki, Wojciech Miloch, Manabu Yagi, Yuto Katoh

  Symposium on Planetary Science 2019, Feb. 2019, English, Sendai, International conference

  Poster presentation


• Nonlinear Processes of Whistler-Mode Chorus Generation in the Earth's Inner Magnetosphere

  Yuto Kato, Yoshiharu Omura, Yohei Miyake, Hideyuki Usui, Hiroshi Nakashima

  Proc. AGU Fall Meeting 2018, Dec. 2018, English

  [Invited]


• 大気吸入型イオンエンジン放電室内におけるECRプラズマ生成のPIC法を用いた数値解析

  白川遼, 臼井 英之, 三宅洋平, TAGAWA MASAHITO, 西山和孝

  第15回宇宙環境シンポジウム, Nov. 2018, Japanese, Sendai, Domestic conference

  Oral presentation


• 帯電緩和ビーム搭載科学衛星近傍の静電環境に関する粒子シミュレーション

  岡崎ほのか, 三宅洋平, 臼井英之

  第15回宇宙環境シンポジウム, Nov. 2018, Japanese, Sendai, Domestic conference

  Oral presentation


• 小型磁気圏昼間側マグネトポーズでの電子ダイナミクスに関する全粒子シミュレーション

  臼井 英之, 沖 知起, 三宅 洋平, 寺田 直樹, 関 華奈子, 八木 学, 加藤 雄人

  第144回 地球電磁気・地球惑星圏学会 総会・講演会, Nov. 2018, Japanese, Nagoya, Domestic conference

  Oral presentation


• 月面近傍プラズマ・ダスト環境の粒子モデルシミュレーション

  三宅 洋平, 西野 真木

  第144回 地球電磁気・地球惑星圏学会 総会・講演会, Nov. 2018, Japanese, Nagoya, Domestic conference

  Oral presentation


• テスト粒子シミュレーションによる月面磁気異常上空でのプラズマ速度分布関数解析

  伊藤圭佑, 三宅洋平, 臼井英之

  第15回宇宙環境シンポジウム, Nov. 2018, Japanese, Sendai, Domestic conference

  Oral presentation


• 粒子モデルプラズマ運動論シミュレーションの高効率計算技法

  三宅 洋平

  第二回ポスト「京」時代の天体形成シミュレーション研究会, Oct. 2018, Japanese, 神戸, Domestic conference

  [Invited]

  Invited oral presentation


• Particle in Cell Simulation to Study the Charging and Evolution of Wake Structure of LEO Spacecraft

  Nizam Ahmad, Hideyuki Usui, Yohei Miyake

  18th Asia Simulation Conference, Oct. 2018, English, Kyoto, International conference

  Oral presentation


• Three-Dimensional Particle-In-Cell Simulations on Plasma Disturbance Near a Low-Earth Orbit Spacecraft

  Yukari Sasaki, Hideyuki Usui, Yohei Miyake

  The 13th International School and Symposium on Space Simulations (ISSS-13), Sep. 2018, English, Los Angeles, International conference

  Poster presentation


• The Particle-In- Cell simulation on LEO spacecraft charging and the wake structure using EMSES

  Nizam Ahmad, Hideyuki Usui, Yohei Miyake

  the 37th JSST Annual International Conference on Simulation Technology, Sep. 2018, English, Hokkaidou, International conference

  Oral presentation


• Plasma Particle Simulation of ECR Plasma Generation in Air Breathing Ion Engine (ABIE)

  Ryo Shirakawa, Hideyuki Usui, Yohei Miyake, Masahito Tagawa

  The 13th International School and Symposium on Space Simulations (ISSS-13), Sep. 2018, English, Los Angeles, International conference

  Poster presentation


• Particle Simulation Analysis of Spacecraft Charging Processes in Plasma Wave Environment

  Takeshi Kiriyama, Yohei Miyake, Hideyuki Usui

  The 13th International School and Symposium on Space Simulations (ISSS-13), Sep. 2018, English, Los Angeles, International conference

  Poster presentation


• Numerical Simulations of Dust Plasma Environment near Lunar Surface Numerical Simulations of Dust Plasma Environment near Lunar Surface

  Yohei Miyake

  The 13th International School and Symposium on Space Simulations (ISSS-13), Sep. 2018, English, Los Angeles, International conference

  [Invited]

  Invited oral presentation


• 3D PIC Simulation on the Plasma Dynamics in a Small-Scale Magnetosphere

  Satoki Oki, Hideyuki Usui, Yohei Miyake

  The 13th International School and Symposium on Space Simulations (ISSS-13), Sep. 2018, English, Los Angeles, International conference

  Poster presentation


• Wake Formation behind Small Satellites

  Diako Darian, Wojciech Miloch, Yohei Miyake, Mikael Mortensen, Hideyuki Usui

  the 15th Spaccraft Charging Technology Conference (SCTC), Jun. 2018, English, Kobe, International conference

  Poster presentation


• Spacecraft Charging Study in Japan

  Kiyokazu Koga, Teppei Okumura, Haruhisa Matsumoto, Yohei Miyake, Hideyuki Usui, Kazuhiro Toyoda, Mengu Cho, Hiroaki Miyake, Tsutomu Nagatsuma

  the 15th Spaccraft Charging Technology Conference (SCTC), Jun. 2018, English, Kobe, International conference

  [Invited]

  Invited oral presentation


• Plasma Particle Simulation of ECR Plasma Generation in Air Breathing Ion Engine (ABIE)

  Ryo Shirakawa, Hideyuki Usui, Yohei Miyake, Masahito Tagawa, Kazutaka Nishiyama

  the 15th Spaccraft Charging Technology Conference (SCTC), Jun. 2018, English, Kobe, International conference

  Poster presentation


• Particle Simulation Analysis of Spacecraft Charging Processes in Plasma Wave Environment

  Takeshi Kiriyama, Yohei Miyake, Yuto Katoh, Hideyuki Usui

  the 15th Spaccraft Charging Technology Conference (SCTC), Jun. 2018, English, Kobe, International conference

  Poster presentation


• Numerical Study on the Plasma Disturbance an Charging Processes by Booms of an Ionospheric Rocket

  Takeshi Kiriyama, Yohei Miyake, Yuto Katoh, Hideyuki Usui

  the 15th Spaccraft Charging Technology Conference (SCTC), Jun. 2018, English, Kobe, International conference

  Poster presentation


• Numerical Study on Plasma Disturbance near a Low-Earth Orbit Satellite

  Yukari Sasaki, Hideyuki Usui, Yohei Miyake, Wojciech Jacek Miloch

  the 15th Spaccraft Charging Technology Conference (SCTC), Jun. 2018, English, Kobe, International conference

  Poster presentation


• Numerical Simulation of Spacecraft Charging Processes in Time-varying Plasma Environment

  Yohei Miyake, Takeshi Kiriyama, Yuto Katoh, Hideyuki Usui

  the 15th Spaccraft Charging Technology Conference (SCTC), Jun. 2018, English, Kobe, International conference

  [Invited]

  Invited oral presentation


• Numerical Modeling of Spacecraft Potential Modulations due to Time-Varying Plasma Wave Fields

  Nizam Ahmad, Hideyuki Usui, Yohei Miyake

  the 15th Spaccraft Charging Technology Conference (SCTC), Jun. 2018, English, Kobe, International conference

  Poster presentation


• 弱磁場天体の小型磁気圏形成に関する全粒子シミュレーション

  沖 知起, 臼井 英之, 寺田 直樹, 関 華奈子, 加藤 雄人, 三宅 洋平, 八木 学

  JPGU, May 2018, Japanese, Chiba, Domestic conference

  Poster presentation


• 月縦孔および地下空洞におけるプラズマ・ダスト輸送の数値シミュレーション

  三宅 洋平, 西野 真木

  JPGU, May 2018, Japanese, Chiba, Domestic conference

  Poster presentation


• メニーコア型クラスタ向け高効率プラズマ粒子シミュレータの開発

  三宅 洋平, 寸村 良樹, 佐伯 拓哉, 中島浩

  JPGU, May 2018, Japanese, Chiba, Domestic conference

  Oral presentation


• Simulation study of the dependence of the whistler-mode chorus generation on properties of energetic electrons in the Earth's inner magnetosphere

  加藤 雄人, 大村 善治, 三宅 洋平, 臼井 英之, 中島 浩

  JPGU, May 2018, Japanese, Chiba, Domestic conference

  Poster presentation


• Numerical Simulation of Spacecraft Charging Processes in Time-varying Plasma Environment

  Yohei Miyake, Takeshi Kiriyama, Yuto Katoh, Hideyuki Usui

  2nd URSI AT-RASC, May 2018, English, Gran Canaria, International conference

  Oral presentation


• Effects of Retained Charge Fluctuations on Lunar Dust Dynamics

  Yohei Miyake

  2nd Joint Symposium between Kobe University and USC, Mar. 2018, English

  [Invited]

  Invited oral presentation


• 小型天体・宇宙プラズマ相互作用過程の粒子シミュレーション

  三宅 洋平, 桐山 武士, 佐々木 紫, Nizam Ahmad, 臼井 英之, 西野 真木

  平成29年度RISH電波科学計算機実験シンポジウム, Mar. 2018, Japanese, Uji, Domestic conference

  Oral presentation


• 宇宙プラズマ・小型固体天体相互作用の粒子シミュレーション

  三宅 洋平, 船木 裕司, 西野 真木, 臼井 英之

  第１９回惑星圏研究会, Feb. 2018, Japanese, Sendai, Domestic conference

  Poster presentation


• プラズマ環境時間変動を考慮した衛星帯電モデリングに関する考察

  MIYAKE Yohei, KIRIYAMA Takeshi, KATOH Yuto, USUI Hideyuki

  PSTEP研究集会「太陽地球圏環境予測のためのモデル研究の展望」第2回, Feb. 2018, Japanese, Domestic conference

  Poster presentation


• Effects of Electrostatic Environment on Charged Particle Transport near Lunar Holes

  MIYAKE Yohei, FUNAKI Yuji, NISHINO Masaki

  AGU Fall Meeting, Dec. 2017, English, International conference

  Oral presentation


• 極域電離圏飛翔体周辺のプラズマじょう乱に関する粒子シミュレーション

  佐々木 紫, 臼井 英之, 三宅 洋平, Wojciech J. Miloch

  第14回宇宙環境シンポジウム, Nov. 2017, Japanese, Kobe, Domestic conference

  Oral presentation


• プラズマ波動電界環境下における人工衛星帯電現象の数値モデリング

  桐山 武士, 三宅 洋平, 臼井 英之, 加藤 雄人

  第14回宇宙環境シンポジウム, Nov. 2017, Japanese, Kobe, Domestic conference

  Oral presentation


• 小型磁気圏形成とそのダイポール磁場強度依存性に関する考察

  臼井 英之, 沖 知起, 三宅 洋平

  第142回 地球電磁気・地球惑星圏学会 総会・講演会, Oct. 2017, Japanese, Uji, Domestic conference

  Oral presentation


• 弱磁場天体の小型磁気圏形成に関する全粒子シミュレーション

  沖 知起, 臼井 英之, 寺田 直樹, 関 華奈子, 加藤 雄人, 三宅 洋平, 八木 学

  第142回 地球電磁気・地球惑星圏学会 総会・講演会, Oct. 2017, Japanese, Uji, Domestic conference

  Poster presentation


• 極域プラズマ観測衛星周辺の非対称電位構造に関する粒子シミュレーション

  MIYAKE Yohei, MILOCH Wojciech, PECSELI Hans

  第142回 地球電磁気・地球惑星圏学会 総会・講演会, Oct. 2017, Japanese, Uji, Domestic conference

  Oral presentation


• 宇宙機推進用イオンビームの電荷中和条件に関する粒子シミュレーション

  薛 宇航, 三宅 洋平, 臼井 英之, 稲永 康隆

  第61回宇宙科学技術連合講演会, Oct. 2017, Japanese, Niigata, Domestic conference

  Poster presentation


• 宇宙環境変動を考慮した衛星帯電シミュレーション研究の現状と展望

  MIYAKE Yohei

  第142回 地球電磁気・地球惑星圏学会 総会・講演会, Oct. 2017, Japanese, Uji, Domestic conference

  [Invited]

  Invited oral presentation


• UZUME計画：月縦孔・地下空洞周辺のプラズマ・ダスト輸送に対する静電気環境の影響

  MIYAKE Yohei, NISHINO Masaki

  第61回宇宙科学技術連合講演会, Oct. 2017, Japanese, Niigata, Domestic conference

  Oral presentation


• Japan-Norway Partnership in space science simulations

  Usui Hideyuki, Wojciech Jacek Miloch, Yohei Miyake, Mikael Mortensen

  Japan-Norway project leaders seminar, Oct. 2017, English, Tokyo, International conference

  [Invited]

  Invited oral presentation


• 地球磁気圏・衛星環境の超並列シミュレーションに向けた高性能プラズマ計算コードの開発

  MIYAKE Yohei, KATOH Yuto, FUKAZAWA Keiichiro, USUI Hideyuki

  ポスト「京」萌芽的課題・計算惑星 アプリケーション開発状況共有ワークショップ, Aug. 2017, Japanese, Domestic conference

  Oral presentation


• Numerical Modeling of Spacecraft Potential Modulations due to Time-Varying Plasma Wave Fields

  Yohei Miyake, T. Kiriyama, Yuto Katoh, Usui Hideyuki

  URSI Genenral Assembly and Scientific Symposium, Aug. 2017, English, Montreal, International conference

  Oral presentation


• 小型天体・太陽風プラズマ相互作用過程の超並列粒子シミュレーション

  MIYAKE Yohei, NISHINO Masaki, FUKUDA Masato, YASUKOCHI Tsubasa, SUMMURA Yoshiki, NAKANO Sho, NIZAM Ahmad, USUI Hideyuki, SHOJI Masafumi, UMEDA Takayuki, OGINO Masao

  名古屋大学HPC 計算科学連携研究プロジェクト成果報告シンポジウム, Jun. 2017, Japanese, Domestic conference

  Oral presentation


• メニーコア型クラスタ向け高効率プラズマ粒子シミュレーターの開発

  SUMMURA Yoshiki, MIYAKE Yohei, KIKURA Keisuke, NAKASHIMA Hiroshi

  ハイパフォーマンスコンピューティングと計算科学シンポジウム, Jun. 2017, Japanese, Domestic conference

  Poster presentation


• 重イオン放出弱磁場小型天体のプラズマ環境に関する粒子シミュレーション

  臼井 英之, 沖 知起, 寺田 直樹, 三宅 洋平, 加藤 雄人, 八木 学

  JPGU, May 2017, Japanese, Chiba, Domestic conference

  Poster presentation


• 極域電離圏飛翔体周辺のプラズマじょう乱に関する粒子シミュレーション

  三宅 洋平, 佐々木 紫, 臼井 英之

  JPGU, May 2017, Japanese, Chiba, Domestic conference

  Poster presentation


• プラズマ波動電界による人工衛星電位変動現象の数値モデリング

  三宅 洋平, 桐山 武士, 加藤 雄人, 臼井 英之

  JPGU, May 2017, Japanese, Chiba, Domestic conference

  Poster presentation


• Particle Simulations of Electric and Dust Environment Near the Lunar Vertical Hole

  Yohei Miyake, Yuji Funaki, Masaki Nishino, Usui Hideyuki

  8th International Conference on the Physics of Dusty Plasmas (ICPDP), May 2017, English, Prague, International conference

  Poster presentation


• Education without borders: how to achieve the best synergy in Japanese-Norwegian academic projects

  Wojciech Jacek Miloch, Usui Hideyuki, Yohei Miyake, Mikael Mortensen

  Birkeland 150 year Anniversary Symposium “The Heritage of Kristian Birkeland”, Apr. 2017, English, Tokyo, International conference

  [Invited]

  Invited oral presentation


• 磁場印加型イオン成膜装置内部の荷電粒子ダイナミクスに関するシミュレーション

  福田 雅人, 臼井 英之, 三宅 洋平, 山本 兼司, 奈良井 哲, 水野 雅夫, 二井 裕瑛

  第64回応用物理学会春季学術講演会, Mar. 2017, Japanese, Yokohama, Domestic conference

  Oral presentation


• プラズマ波動電界存在下での衛星電位変動の数値モデリング

  三宅 洋平, 桐山 武士, 加藤 雄人, 臼井 英之

  平成28年度RISH電波科学計算機実験シンポジウム, Mar. 2017, Japanese, Uji, Domestic conference

  Poster presentation


• イオンビームの工学利用に関する粒子シミュレーション

  臼井 英之, 三宅 洋平, 福田 雅人, 中野 祥, 薛 宇航

  平成28年度RISH電波科学計算機実験シンポジウム, Mar. 2017, Japanese, Uji, Domestic conference

  Poster presentation


• 次世代プラズマ粒子シミュレーションへのOhHelp実装の展望

  MIYAKE Yohei, SUMMURA Yoshiki

  OhHelp情報交換会, Feb. 2017, Japanese, Domestic conference

  Oral presentation


• Numerical Study on Plasma and Dust Environment around Lunar Vertical Holes

  MIYAKE Yohei, NISHINO Masaki

  宇宙科学シンポジウム, Jan. 2017, Japanese, Domestic conference

  Poster presentation


• プラズマ波動存在下での衛星近傍プラズマ環境変動の数値モデリング

  MIYAKE Yohei, KIRIYAMA Takeshi, KATOH Yuto, USUI Hideyuki

  PSTEP研究集会「太陽地球圏環境予測のためのモデル研究の展望」, Jan. 2017, Japanese, Domestic conference

  Poster presentation


• 科学衛星－宇宙プラズマ環境相互作用の数値シミュレーション研究

  MIYAKE Yohei

  第332回生存圏シンポジウム「宇宙プラズマ波動研究会」, Dec. 2016, Japanese, Domestic conference

  [Invited]

  Invited oral presentation


• プラズマシミュレーション援用による大気吸入型イオンエンジンの実験的研究

  安河内 翼, 臼井 英之, 三宅 洋平, 福田 雅人, 横田 久美子, 田川 雅人

  第332回生存圏シンポジウム宇宙プラズマ波動研究会, Dec. 2016, Japanese, Uji, Domestic conference

  Poster presentation


• Particle Simulations on Plasma and Dust Environment near Lunar Vertical Holes

  MIYAKE Yohei, FUNAKI Yuji, NISHINO Masaki

  AGU Fall Meeting, Dec. 2016, English, International conference

  Oral presentation


• Electron current in the boundary layer of a mini-magnetosphere above a lunar magnetic anomaly

  Usui Hideyuki, Miyake Yohei, Nishino Masaki

  American Geophysical Union (AGU) Fall meeting, Dec. 2016, English, SanFrancisco, International conference

  Poster presentation


• Diamagnetic effect in the foremoon solar wind observed by Kaguya

  NISHINO Masaki, SAITO Yoshifumi, TSUNAKAWA Hideo, MIYAKE Yohei, HARADA Yuki, YOKOTA Shoichiro, TAKAHASHI Futoshi, MATSUSHIMA Masaki, SHIBUYA Hidetoshi, SHIMIZU Hisayoshi

  AGU Fall Meeting, Dec. 2016, English, International conference

  Poster presentation


• 月面磁気異常上空のミニ磁気圏境界層における電子電流

  臼井 英之, 三宅 洋平, 西野 真木

  第140回 地球電磁気・地球惑星圏学会 総会・講演会, Nov. 2016, Japanese, Hakata, Domestic conference

  Oral presentation


• 月面近傍ダストの帯電過程とそのダイナミクスに関する粒子シミュレーション

  FUNAKI Yuji, MIYAKE Yohei, NISHINO Masaki

  第140回地球電磁気・地球惑星圏学会 総会・講演会, Nov. 2016, Japanese, Domestic conference

  Oral presentation


• メニーコア型スーパーコンピュータ向け高効率プラズマ粒子シミュレーターの開発

  MIYAKE Yohei, SUMMURA Yoshiki, NAKASHIMA Hiroshi

  NIFS数値実験炉プロジェクト全体会議, Nov. 2016, Japanese, Domestic conference

  [Invited]

  Invited oral presentation


• プラズマ波動交番電界中 の衛星電位変動現象の 数値モデリング

  MIYAKE Yohei, KATOH Yuto, USUI Hideyuki, KIRIYAMA Takeshi

  第140回地球電磁気・地球惑星圏学会 総会・講演会, Nov. 2016, Japanese, Domestic conference

  Oral presentation


• Diagnozing LEO satellite anomalies using NOAA 15 electron data in association with geomagnetic perturbations

  Nizam Ahmad, Dhani Herdiwijaya, Thomas Djamaluddin, Hideyuki Usui, Miyake Yohei

  第１３回宇宙環境シンポジウム, Nov. 2016, English, Musashi-koganei, Domestic conference

  Oral presentation


• 放電室内電界分布の計算結果を考慮した大気吸入型イオンエンジンの実験的研究

  安河内 翼, 臼井 英之, 三宅 洋平, 福田 雅人, 横田 久美子, 田川 雅人

  第60回宇宙科学技術連合講演会, Sep. 2016, Japanese, Hakodate, Domestic conference

  Oral presentation


• 超低軌道領域における大気吸入型イオンエンジンの利用と課題

  安河内 翼, 臼井 英之, 三宅 洋平, 福田 雅人, 横田 久美子, 田川 雅人

  第60回宇宙科学技術連合講演会, Sep. 2016, Japanese, Hakodate, Domestic conference

  Oral presentation


• PIC modeling of spacecraft-plasma interaction effects on double-probe electric field measurements

  MIYAKE Yohei, USUI Hideyuki, NISHIMURA Yukitoshi, KASABA Yasumasa

  STEシミュレーション研究会, Sep. 2016, Japanese, Domestic conference

  Oral presentation


• 宇宙電磁環境シミュレーション：小型天体・人工衛星近傍プラズマじょう乱の大規模計算機実験

  MIYAKE Yohei

  KOBE HPC Summer School 2016, Aug. 2016, Japanese, Domestic conference

  [Invited]

  Invited oral presentation


• 超並列粒子コードを用いた ジオ・スペースプラズマ 理工学シミュレーション

  MIYAKE Yohei, SHOJI Masafumi, KAWAGUCHI Shin-ichiro, KIKURA Keisuke, MATSUBARA Takuma, KITO Saki, NISHINO Masaki, UMEDA Takayuki, ISHII Katsuya

  名古屋大学HPC 計算科学連携研究プロジェクト成果報告シンポジウム, Jun. 2016, Japanese, Domestic conference

  Oral presentation


• Manycore-Aware Implementation of Parallel Plasma Particle-in-Cell Simulation Code

  MIYAKE Yohei, KIKURA Keisuke, SUMMURA Yoshiki, NAKASHIMA Hiroshi

  計算工学講演会, Jun. 2016, Japanese, Domestic conference

  Oral presentation


• メニーコア型クラスタ向け高効率プラズマ粒子計算手法の研究

  MIYAKE Yohei, KIKURA Keisuke, SUMMURA Yoshiki, NAKASHIMA Hiroshi

  ハイパフォーマンスコンピューティングと計算科学シンポジウム, Jun. 2016, Japanese, Domestic conference

  Poster presentation


• 磁気異常上空の小型磁気圏境界における電子ダイナミクスに関する粒子シミュレーション解析

  臼井 英之, 松原 琢磨, 三宅 洋平

  JPGU, May 2016, Japanese, Chiba, Domestic conference

  Oral presentation


• Particle simulations on charged dust dynamics in the lunar plasma environment

  MIYAKE Yohei, NISHINO Masaki

  日本地球惑星科学連合2016年大会, May 2016, Japanese, Domestic conference

  Oral presentation


• 月周辺プラズマ環境の高並列プラズマ粒子シミュレーション

  MIYAKE Yohei, USUI Hideyuki, NISHINO Masaki, KIKURA Keisuke

  九州大学先端的計算科学研究プロジェクト 平成27年度成果報告会, Apr. 2016, Japanese, Domestic conference

  Oral presentation


• 分子流入を考慮した大気吸入型イオンエンジンの中性粒子シミュレーション

  安河内 翼, 臼井 英之, 三宅 洋平, 福田 雅人, 横田 久美子, 田川 雅人

  第63回応用物理学会春季学術講演会, Mar. 2016, Japanese, Tokyo, Domestic conference

  Oral presentation


• 人工衛星搭載イオンエンジン中和器の地上実験に関するプラズマ数値シミュレーション

  谷邊 耕太, 臼井 英之, 三宅 洋平

  平成２7年度RISH電波科学計算機実験シンポジウム, Mar. 2016, Japanese, Uji, Domestic conference

  Poster presentation


• 月縦孔プラズマ静電環境に関する大規模粒子シミュレーション

  三宅 洋平, 船木 裕司, 西野 真木

  平成27年度RISH電波科学計算機実験シンポジウム, Mar. 2016, Japanese, Uji, Domestic conference

  Oral presentation


• メニーコアプロセッサ向け高効率プラズマ粒子計算手法の研究

  木倉 佳祐, 三宅 洋平, 臼井 英之, 中島 浩

  平成27年度RISH電波科学計算機実験シンポジウム, Mar. 2016, Japanese, Uji, Domestic conference

  Oral presentation


• プラズマシミュレーションを用いたABIE放電室内における中性粒子吸入を考慮したプラズマ生成解析

  川口 伸一郎, 臼井 英之, 三宅 洋平, 安河内 翼, 福田 雅人, YOKOTA KUMIKO, TAGAWA MASAHITO

  第12回宇宙環境シンポジウム, Nov. 2015, Japanese, Kitakyushu, Domestic conference

  Oral presentation


• 月面磁気異常上空の太陽風電子ダイナミクスの３次元シミュレーション解析

  松原 琢磨, 臼井 英之, 沼波 政倫, 松本 正晴, 西野 真木, 三宅 洋平

  地球電磁気・地球惑星圏学会 第138回総会及び講演会, Oct. 2015, Japanese, Tokyo, Domestic conference

  Oral presentation


• プラズマシミュレーション援用による大気吸入型イオンエンジン開発に向けたプラズマ解析と実機検証

  川口 伸一郎, 臼井 英之, 三宅 洋平, 安河内 翼, YOKOTA KUMIKO, TAGAWA MASAHITO

  第58回宇宙科学技術連合講演会, Oct. 2015, Japanese, Kagoshima, Domestic conference

  Poster presentation


• Three Dimensional Particle-In-Cell Simulation for the Development of Air Breathing Ion Engine

  川口 伸一郎, 臼井 英之, 三宅 洋平, 安河内 翼, 福田 雅人, YOKOTA KUMIKO, TAGAWA MASAHITO

  Joint Conference of 30th International Symposium on Space Technology and Science, 34th International Electric Propulsion Conference and 6th Nano-satellite Symposium, Jul. 2015, English, Kobe, International conference

  Poster presentation


• Numerical Simulation of ECR Plasma in Air Breathing Ion engine (ABIE): Neutral Gas Density Distribution and ECR Plasma Formation

  Yasukochi Tsubasa, Usui Hideyuki, Miyake Yohei, Kawaguchi Shin-ichirou, Fukuda Masato, Yokota Kumiko, Tagawa Masahito

  Joint Conference of 30th International Symposium on Space Technology and Science, 34th International Electric Propulsion Conference and 6th Nano-satellite Symposium, Jul. 2015, English, Kobe, International conference

  Poster presentation


• 月面磁気異常上空における太陽風応答の3次元全粒子シミュレーション

  USUI Hideyuki, 梅澤 美佐子, 三宅 洋平, 西野 真木, 芦田 康将

  JPGU, May 2015, Japanese, Chiba, Domestic conference

  Oral presentation


• 小型天体表面・太陽風プラズマ相互作用過程の高並列粒子シミュレーション

  MIYAKE YOHEI

  先駆的科学計算に関するフォーラム2015, Apr. 2015, Japanese, Domestic conference

  Oral presentation


• 月の縦孔周辺のプラズマ静電環境に関する粒子シミュレーション

  MIYAKE Yohei, NISHINO N. Masaki

  第5回 月と火星の縦孔・地下空洞探査研究会, Mar. 2015, Japanese, Sagamihara, Domestic conference

  Oral presentation


• 超並列粒子コードを用いたジオ・スペースプラズマ理工学シミュレーション

  MIYAKE Yohei

  名古屋大学HPC 計算科学連携研究プロジェクト成果報告名古屋大学HPC 計算科学連携研究プロジェクト成果報告シンポジウム, 2015, Japanese, Domestic conference

  Oral presentation


• 縦孔・地下空洞周辺の月面帯電に関するプラズマ粒子シミュレーション

  MIYAKE Yohei, NISHINO Masaki

  第12回宇宙環境シンポジウム, 2015, Japanese, Domestic conference

  Oral presentation


• 月縦孔周辺のプラズマ・ダスト環境に関する粒子シミュレーション

  MIYAKE Yohei, NISHINO Masaki

  日本地球惑星科学連合 連合大会, 2015, Japanese, Domestic conference

  Oral presentation


• Electrostatic plasma environment of lunar holes: surface charging properties near sunlit-shadow boundary

  MIYAKE Yohei, NISHINO Masaki

  第138回SGEPSS総会および講演会, 2015, Japanese, Domestic conference

  Poster presentation


• Particle Simulations on Electrostatic Plasma Environment near Lunar Vertical Holes

  MIYAKE Yohei, NISHINO Masaki

  第59回宇宙科学技術連合講演会, 2015, Japanese, Domestic conference

  Oral presentation


• プラズマ粒子シミュレーションのメニーコアプロセッサ向け最適化手法の探求

  KIKURA Keisuke, MIYAKE Yohei, USUI Hideyuki, NAKASHIMA Hiroshi

  ハイパフォーマンスコンピューティングと計算科学シンポジウム, 2015, Japanese, Domestic conference

  Poster presentation


• Spacecraft-Plasma Interaction Effects on In-Space Electric Field Measurements

  MIYAKE Yohei

  URSI-Japan Radio Science Meeting, 2015, English, International conference

  [Invited]

  Invited oral presentation


• Prototype Implementation and Its Fundamental Performance Evaluation of a Manycore-Aware OhHelp'ed PIC Simulation Code

  NAKASHIMA Hiroshi, KIKURA Keisuke, MIYAKE Yohei

  第153回HPC研究発表会, 2015, Japanese, Domestic conference

  Oral presentation


• Optimization of Parallel Plasma Particle Simulations on MIC Architecture

  MIYAKE Yohei, KIKURA Keisuke, USUI Hideyuki, NAKASHIMA Hiroshi

  計算工学講演会, 2015, Japanese, Domestic conference

  Oral presentation


• Full-Particle Simulations on Plasma Environment around Lunar Vertical Hole

  MIYAKE Yohei, NISHINO Masaki

  Symposium for Space Simulations, 2015, English, International conference

  Oral presentation


• Full-Particle Simulations on Electrostatic Plasma Environment near Lunar Vertical Holes

  MIYAKE Yohei, NISHINO Masaki

  AGU Fall Meeting, 2015, English, International conference

  Poster presentation


• Full-Particle Simulations on Electrostatic Plasma Environment near Lunar Vertical Holes

  MIYAKE Yohei, NISHINO Masaki

  47th Lunar and Planetary Science Conference, 2015, English, International conference

  Poster presentation


• Exploration of Lunar and Planetary Holes and Subsurface Caverns: Measurement of Electromagnetic Environment

  NISHINO Masaki, SHIMIZU Hisayoshi, TSUNAKAWA Hideo, SAITO Yoshifumi, MIYAKE Yohei

  International Symposium on Space Technology and Science, 2015, English, International conference

  Oral presentation


• Electron­hybrid simulations of the dependencies of the generation process of whistler modeemissions

  KATOH Yuto, OMURA Yoshiharu, MIYAKE Yohei, USUI Hideyuki, NAKASHIMA Hiroshi

  Symposium for Space Simulations, 2015, English, International conference

  Poster presentation


• Effect of Surface Topography on the Lunar ElectrostaticEffect of Surface Topography on the Lunar Electrostatic Environment: 3D Plasma Particle Simulations

  MIYAKE Yohei, NISHINO Masaki

  Symposium on Planetary Science 2016, 2015, Japanese, Domestic conference

  Oral presentation


• Dependencies of the Generation Process of Whistler-Mode Emissions on the Kinetic Energy of Anisotropic Electrons in the Earth's Inner Magnetosphere

  KATOH Yuto, OMURA Yoshiharu, MIYAKE Yohei, USUI Hideyuki, NAKASHIMA Hiroshi

  AGU Fall Meeting, 2015, English, International conference

  Poster presentation


• Dependencies of the Generation Process of Whistler-Mode Emissions on Temperature Anisotropy of Energetic Electrons in the Earth's Inner Magnetosphere

  KATOH Yuto, OMURA Yoshiharu, MIYAKE Yohei, USUI Hideyuki, NAKASHIMA Hiroshi

  URSI-Japan Radio Science Meeting, 2015, English, International conference

  Invited oral presentation


• 超並列宇宙プラズマ粒子シミュレーションの研究

  MIYAKE Yohei

  Annual Meeting on Advanced Computing System and Infrastructure, Jan. 2015, Japanese, Tsukuba, Domestic conference

  [Invited]

  Invited oral presentation


• PIC Simulation on Plasma Flow Response to a Meso-scale Magnetic Dipole in Space

  USUI Hideyuki, UMEZAWA Misako, MIYAKE Yohei

  SciTECH2015, Jan. 2015, English, USA, International conference

  Oral presentation


• 小型ダイポール磁場のプラズマ流応答に関する3次元粒子シミュレーション

  USUI Hideyuki, ASHIDA Yasumasa, SHINOHARA Iku, NAKAMURA Masao, UMEZAWA Misako, MIYAKE Yohei

  第11回宇宙環境シンポジウム, Dec. 2014, Japanese, Osaka, Domestic conference

  Oral presentation


• プラズマ粒子シミュレーションのメニーコアアーキテクチャ向け高効率実装の展望

  MIYAKE Yohei, KIKURA Keisuke, USUI Hideyuki, NAKASHIMA Hiroshi

  STEシミュレーション研究会, Dec. 2014, Japanese, Tokyo, Domestic conference

  Oral presentation


• Photoelectron and Secondary Electron Dynamics Around the Solar Probe Plus Spacecraft

  MIYAKE Yohei, USUI Hideyuki

  AGU Fall Meeting, Dec. 2014, English, San Francisco, USA, International conference

  Poster presentation


• 3次元PICシミュレーションを用いた大気吸入型イオンエンジン放電室内部におけるプラズマ生成解析

  KAWAGUCHI Shinichiro, USUI Hideyuki, MIYAKE Yohei, YASUKOCHI Tsubasa, FUKUDA Masato, YOKOTA Kumiko, TAGAWA Masato

  第11回宇宙環境シンポジウム, Dec. 2014, Japanese, Osaka, Domestic conference

  Oral presentation


• Full Particle-In-Cell 3D simulation on the interactions between the solar wind and a lunar magnetic anomaly

  UMEZAWA Misako, USUI Hideyuki, MIYAKE Yohei, NISHINO N. Masaki

  地球電磁気・地球惑星圏学会第136回総会・講演会, Nov. 2014, Japanese, Matsumoto, Domestic conference

  Oral presentation


• 月の縦孔周辺のプラズマ環境に関する粒子シミュレーション

  MIYAKE Yohei, NISHINO N. Masaki

  地球電磁気・地球惑星圏学会第136回総会・講演会, Nov. 2014, Japanese, Matsumoto, Domestic conference

  Oral presentation


• Large-scale Particle Simulations on Space Plasma Interaction with Scientific Spacecraft

  MIYAKE Yohei

  Plasma Conference 2014, Nov. 2014, English, Niigata, International conference

  [Invited]

  Invited oral presentation


• 3次元プラズマシミュレーションをもちいた大気吸入型イオンエンジン開発のためのECRプラズマ生成解析

  KAWAGUCHI Shinichiro, USUI Hideyuki, MIYAKE Yohei, YOKOTA Kumiko, TAGAWA Masato, YASUKOCHI Tsubasa

  第58回宇宙科学技術連合講演会, Nov. 2014, Japanese, Nagasaki, Domestic conference

  Oral presentation


• 人工衛星・宇宙プラズマ相互作用の大規模粒子シミュレーション研究

  MIYAKE Yohei

  日本航空宇宙学会関西支部第448回航空懇談会, Sep. 2014, Japanese, Kobe, Domestic conference

  [Invited]

  Invited oral presentation


• Electromagnetic Plasma Particle Simulations on Solar Probe Plus Spacecraft Interaction with Near-Sun Plasma Environment

  MIYAKE Yohei, USUI Hideyuki

  40th COSPAR Scientific Assembly, Aug. 2014, English, Moscow, Russia, International conference

  Oral presentation


• 超並列宇宙プラズマ粒子シミュレーションの研究

  USUI Hideyuki, MIYAKE Yohei, OMURA Yoshiharu, NAKASHIMA Hiroshi

  JHPCN：学際大規模情報基盤共同利用・共同研究拠点 第6回 シンポジウム,, Jul. 2014, Japanese, Tokyo, Domestic conference

  Nominated symposium


• Particle Simulations of Spacecraft-Plasma Interactions and their Effects on Electric Field Measurements

  MIYAKE Yohei, USUI Hideyuki

  AOGS 11th Annual Meeting, Jul. 2014, English, Sapporo, International conference

  Poster presentation


• Electromagnetic Full-Par- ticle Simulations on Spacecraft Interactions with Near-Sun Environment

  MIYAKE Yohei, USUI Hideyuki

  13th Spacecraft Charging Technology Conference, Jun. 2014, English, Pasadena, USA, International conference

  Poster presentation


• 超並列粒子コードを用いたジオ・スペースプラズマ理工学シミュレーション

  MIYAKE Yohei

  名古屋大学HPC計算科学連携研究プロジェクト成果報告シンポジウム, May 2014, Japanese, Nagoya, Domestic conference

  Oral presentation


• 小型ダイポール磁場とプラズマ流の相互作用に関する３次元粒子シミュレーション

  USUI Hideyuki, ASHIDA Yasumasa, SHINOHARA Iku, NAKAMURA Masao, YAMAKAWA Hiroshi, MIYAKE Yohei

  JPGU, May 2014, Japanese, Yokohama, Domestic conference

  Poster presentation


• 大気吸入型イオンエンジン内のプラズマ生成に関する粒子シミュレーション

  川口 伸一郎, 本山 貴仁, USUI HIDEYUKI, MIYAKE YOHEI, 田川 雅人

  京都大学生存圏シンポジウム（KDKシンポジウム）, Mar. 2014, Japanese, 京都市, Domestic conference

  Poster presentation


• 科学衛星近傍のプラズマ電磁擾乱に関する大規模粒子シミュレーション研究

  MIYAKE YOHEI

  第248回生存圏シンポジウム, Mar. 2014, Japanese, Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Domestic conference

  [Invited]

  Invited oral presentation


• 大気吸入型イオンエンジン放電室内におけるプラズマ生成シミュレーション

  Takahito Motoyama, Hideyuki Usui, Yohei Miyake, Shinichiro Kawaguchi, Kumiko Yokota, Masahito Tagawa

  第10回宇宙環境シンポジウム, Dec. 2013, Japanese, JAXA, Tokyo, abbreviated, Domestic conference

  Oral presentation


• 大気吸入型イオンエンジン放電室内におけるプラズマ生成シミュレーション

  本山 貴仁, USUI HIDEYUKI, MIYAKE YOHEI, 田川 雅人

  宇宙環境シンポジウム, Dec. 2013, Japanese, 東京, Domestic conference

  Oral presentation


• 太陽近傍プラズマ環境下での科学衛星帯電に関する粒子シミュレーション

  MIYAKE YOHEI, USUI HIDEYUKI, ISSI Team, Interaction of Satellite with, Space Environment

  第10回宇宙環境シンポジウム, Dec. 2013, Japanese, JAXA, Tokyo, Domestic conference

  Oral presentation


• PIC simulations on plasma response to a meso-scale magnetic dipole

  USUI Hideyuki, UMEZAWA Misako, NISHINO Masaki, MIYAKE Yohei, MATSUMOTO Masaharu

  AGU Fall meeting, Dec. 2013, English, San Francisco, International conference

  Poster presentation


• Modeling and Simulations of the Double-Probe Electric Field Instrument in Tenuous and Cold Streaming Plasmas

  MIYAKE YOHEI, CULLY CHRISTOPHER, USUI HIDEYUKI, NAKASHIMA HIROSHI

  AGU Fall Meeting 2013, Dec. 2013, English, American Geophysical Union, San Francisco, USA, International conference

  Poster presentation


• Particle-In-Cell Simulation on Spacecraft Interactions with Solar Coronal Plasma

  MIYAKE YOHEI, USUI HIDEYUKI, R. March, ISSI Team, Interaction of Satellite with, Space Environment, URABE HIROAKI

  SGEPSS Fall Meeting 2013, Nov. 2013, Japanese, Society of Geomagnetism and Earth, Planetary and Space Sciences, Kochi, Domestic conference

  Poster presentation


• Full Particle Simulations on Space Plasma Interactions with Scientific Satellite

  MIYAKE YOHEI, USUI HIDEYUKI, NAKASHIMA HIROSHI

  Asia-Pacific Radio Science Conference (AP-RASC) 2013, Sep. 2013, English, National Taiwan University, Taipei, Taiwan, International conference

  [Invited]

  Invited oral presentation


• Microwave Plasma Simulation for the Development of Air Breathing Ion Engine

  Takahito Motoyama, Hideyuki Usui, Yohei Miyake, Akihiko Hashimoto, Masahito Tagawa, Kumiko Yokota

  The 11th International School Symposium for Space Simulations, Aug. 2013, English, abbreviated, International conference

  Oral presentation


• Particle Simulations of Electromagnetic Environment around Scientific Spacecraft

  MIYAKE YOHEI, USUI HIDEYUKI

  11th International School/Symposium for Space Simulations, Jul. 2013, English, National Central University, Jhongli, Taiwan, International conference

  [Invited]

  Invited oral presentation


• Particle-in-cell simulation on the interactions between the solar wind and a magnetic anomaly on the moon

  UMEZAWA Misako, USUI Hideyuki, MIYAKE Yohei, Nishino Masaki

  The 11th International School for Space Simulation (ISSS11), Jul. 2013, English, Taipei, International conference

  Poster presentation


• Microwave plasmasimulation for the development of air breathing ion engine

  MOTOYAMA Takahito, USUI Hideyuki, MIYAKE Yohei, TAGAWA Masato

  The 11th International School for Space Simulation (ISSS11), Jul. 2013, English, Taipei, International conference

  Poster presentation


• Low-Cost Load Balancing for Parallel Particle-In-Cell Simulations with Thick Overlapping Layers

  MIYAKE YOHEI, NAKASHIMA HIROSHI

  11th IEEE ISPA, Jul. 2013, English, Deakin University, Melbourne, Australia, International conference

  Oral presentation


• 動的負荷分散技法OhHelpを用いた超並列プラズマ全粒子シミュレーション

  MIYAKE YOHEI

  第9回計算科学ユニットセミナー, Jun. 2013, Japanese, 京都大学計算科学ユニット, Kyoto, Domestic conference

  [Invited]

  Invited oral presentation


• Microwave plasma simulation for the development of air breathing ion engine

  Takahito Motoyama, Hideyuki Usui, Yohei Miyake, Kumiko Yokota, Masahito Tagawa

  The 29th International Space Technology and Sciences, Jun. 2013, English, JSASS, Nagoya, abbreviated, International conference

  Oral presentation


• 太陽風プラズマと月面局所磁場の相互作用に関する粒子シミュレーション

  梅澤 美佐子, USUI HIDEYUKI, 松本 正晴, 西野 真木, MIYAKE YOHEI

  日本地球惑星科学連合2013年大会, May 2013, Japanese, 千葉市, Domestic conference

  Poster presentation


• International Collaborative Study on Spacecraft-Plasma Interactions in the Near-Sun Environment

  MIYAKE YOHEI, URABE HIROAKI, USUI HIDEYUKI, ISSI Team, Interaction of Satellite with, Space Environment

  Japan Geoscience Union Meeting 2012, May 2013, Japanese, Japan Geoscience Union, Chiba, Domestic conference

  Oral presentation


• プラズマ粒子シミュレーションによる太陽風－小型ダイポール磁場相互作用の解析とそのReiner Gamma磁場への応用

  USUI HIDEYUKI, 梅澤 美佐子, 松本 正晴, 西野 真木, MIYAKE YOHEI

  日本地球惑星科学連合2013年大会, May 2013, Japanese, 千葉市, Domestic conference

  Oral presentation


• OhHelp Load Balancer for Scalable Domain-Decomposed Plasma Particle Simulations: Current Status and Future Prospects

  MIYAKE YOHEI, NAKASHIMA HIROSHI

  STE Simulation Symposium, Mar. 2013, Japanese, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Domestic conference

  Oral presentation


• Plasma Particle Simulations on Interactions Between Spacecraft and Cold Streaming Plasmas

  MIYAKE YOHEI, USUI HIDEYUKI, NAKASHIMA HIROSHI

  AGU Fall Meeting 2012, Dec. 2012, English, American Geophysical Union, San Francisco, USA, International conference

  Poster presentation


• Scalable Parallelization of Full-PIC Plasma Simulations with the OhHelp Load Balancer

  MIYAKE YOHEI, NAKASHIMA HIROSHI

  US-Japan JIFT Workshop 2012, Nov. 2012, English, The University of Texas at Austin, Providence, USA, International conference

  [Invited]

  Invited oral presentation


• Particle Simulations on Properties of a Spacecraft Wake and Its Effects on Double-Probe Measurements in Earth's Magnetosphere

  MIYAKE YOHEI, USUI HIDEYUKI

  SGEPSS Fall Meeting 2012, Oct. 2012, Japanese, Society of Geomagnetism and Earth, Planetary and Space Sciences, Sapporo, Domestic conference

  Oral presentation


• イオンエンジンビームの電子‐イオンカップリングに関する粒子シミュレーション

  USUI HIDEYUKI, MIYAKE YOHEI, MATSUMOTO MASAHARU

  地球電磁気・地球惑星圏学会 第132回総会及び講演会, Oct. 2012, Japanese, SGEPSS, Sapporo,Japan, Domestic conference

  Oral presentation


• Full Particle-In-Cell Simulation of Ion Beam Neutralization

  Hideyuki Usui, Akihiko Hashimoto, Yohei Miyake, Takahito Motoyama

  Conference on Computational Physics (CCP2012), Oct. 2012, English, Kobe,Japan, International conference

  Poster presentation


• Development of a Scalable PIC Simulator and Its Application to Spacecraft Interaction with Streaming Plasma

  MIYAKE YOHEI, NAKASHIMA HIROSHI, USUI HIDEYUKI

  Conference on Computational Physics 2012, Oct. 2012, English, Osaka University, Kobe, International conference

  Poster presentation


• Development of a Scalable PIC Simulator and Its Application to Spacecraft-Plasma Interaction Problems

  MIYAKE YOHEI, NAKASHIMA HIROSHI, USUI HIDEYUKI

  JSST 2012 - International Conference on Simulation Technology, Sep. 2012, English, Japan Society for Simulation Technology, Kobe, International conference

  Oral presentation


• 超並列宇宙プラズマ粒子シミュレーションの研究

  大村 善治, USUI HIDEYUKI, MIYAKE YOHEI, 小路 真史

  学際大規模情報基盤共同利用・共同研究拠点第3回シンポジウム, Jul. 2012, Japanese, JHPCN, Tokyo,Japan, Domestic conference

  Oral presentation


• Development of a Scalable PIC Simulator for Spacecraft-Plasma Interaction Problems

  MIYAKE YOHEI, NAKASHIMA HIROSHI, USUI HIDEYUKI

  VECPAR 2012 - 10th International Meeting, Jul. 2012, English, RIKEN Advanced Institute for Computational Science, Kobe, International conference

  Poster presentation


• Plasma Particle Simulations on Spacecraft Wake Effects on Electric Field Measurements

  MIYAKE YOHEI, USUI HIDEYUKI

  Japan Geoscience Union Meeting 2012, May 2012, Japanese, Japan Geoscience Union, Chiba, Domestic conference

  Oral presentation


• イオンエンジン局所ビームの中和電子ダイナミクスに関する粒子シミュレーション

  USUI HIDEYUKI, MIYAKE YOHEI

  JPGU 日本地球惑星科学連合2012年大会, May 2012, Japanese, JPGU, Makuhari,Japan, Domestic conference

  Poster presentation


• Particle Simulations of Wake Effects on Electric Field Measurements in Multi-species Cold Ion Flows

  MIYAKE YOHEI, USUI HIDEYUKI

  12th Spacecraft Charging Technology Conference, May 2012, English, Mengu Cho, Kitakyushu, International conference

  Poster presentation


• GPGPUによるプラズマ粒子シミュレーション

  USUI HIDEYUKI, 山本 拓実, MIYAKE YOHEI

  計算工学学会 第17回計算工学講演会, May 2012, Japanese, 計算工学会, Kyoto,Japan, International conference

  Oral presentation


• Full PIC Simulation of Ion Beam Neutralization

  Hideyuki Usui, Akihiro Hashimoto, Yohei Miyake

  The12th Spacecraft Charging Technology Conference, May 2012, English, Kyushu Institute of Technology, Kitakyushu,Japan, International conference

  Poster presentation


• A Scalable Load-Balancing Algorithm for Massively-Parallel Plasma Particle Simulations

  Yohei Miyake, Hiroshi Nakashima, Hideyuki Usui

  2011 US-Japan JIFT Workshop, Dec. 2011, English, Hiroaki Ohtani, Alex Arefiev, 核融合科学研究所, International conference

  [Invited]

  Invited oral presentation


• 衛星搭載電界センサー計測におけるスプリアス電界特性に関する計算機実験

  三宅 洋平, 臼井 英之, 小嶋 浩嗣

  地球電磁気・地球惑星圏学会(SGEPSS)秋学会, Nov. 2011, Japanese, 神戸大学, Domestic conference

  Poster presentation


• 衛星帯電環境下におけるダブルプローブ電場観測に関するプラズマ粒子シミュレーション

  三宅 洋平, 臼井 英之, 小嶋 浩嗣

  第8回宇宙環境シンポジウム, Oct. 2011, Japanese, 東京ビックサイト, Domestic conference

  Oral presentation


• Plasma Particle Simulations on Electric Antenna and Spacecraft Environment

  Yohei Miyake, Hideyuki Usui, Hirotsugu Kojima

  The XXXth URSI General Assembly and Scientific Symposium, Aug. 2011, English, A. Hamit Serbest, Istanbul, Turkey, International conference

  [Invited]

  Invited oral presentation


• Particle-In-Cell Simulations on Plasma Environment Around Spacecraft-Onboard Electric Field Sensors

  Yohei Miyake, Hideyuki Usui, Hirotsugu Kojima

  The 10th International School/Symposium for Space Simulations, Jul. 2011, English, R. D. Sydora, R. Marchand, Banff, Canada, International conference

  Poster presentation


• 科学衛星搭載用電界センサー周辺の光電子環境に関する計算機実験

  三宅 洋平, 臼井 英之, 小嶋 浩嗣

  日本地球惑星科学連合2011年大会, May 2011, Japanese, 幕張メッセ国際会議場, Domestic conference

  Poster presentation

• American Geophysical Union

  - Present

  IRI


• Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS)

  - Present

  IRI

• Evolution of carbon and nitrogen and generation of prebiotic molecules in the Martian atmosphere

  寺田 直樹, 古川 善博, 黒田 剛史, 三宅 洋平, 関 華奈子, 青木 翔平, 横田 勝一郎, 倉本 圭

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Tohoku University, Apr. 2022 - Mar. 2027, Coinvestigator


• Study on long-range effects of object-plasma interactions in space

  三宅 洋平

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2020 - 31 Mar. 2023

  本課題では、固体表面と宇宙プラズマの相互作用に起因する乱れが、如何に周囲に波及するかという学術的な問いに、粒子モデル運動論プラズマシミュレーションを用いて取り組む。2022年度の実施内容を下記に示す。 ①数値研究の基盤技術として、計算荷電粒子と格子点上の電磁場配列を各プロセッサに均等に割りつける技法と、荷電粒子と電磁場の相互作用計算時のメモリ参照パターンを規則化する技術を併せ持つプラズマ粒子シミュレータの開発を進めている。2022年度はこれに固体表面に対応する内部境界処理を適切に導入することで、最先端の高効率プラズマ粒子計算技術を固体プラズマ相互作用研究に利活用する道筋を切り拓いた。 ②プラズマ流中の固体微粒子の後方に形成される航跡構造に着目した大規模計算機実験解析を実施した。その結果、磁場を伴わないプラズマ中では特定の振動パターンを有する静的構造が微粒子後方に認められた。当問題と、船舶が水面を進行する際に後方に形成されるケルヴィン波との類似性に着目し、非磁化プラズマ中のイオン音波の分散特性から電位振動パターンの等位相面の構造を理解することを試みた。その結果、等位相面の拡がり角や有限イオン温度効果による振動消失領域が当該波動モードの分散特性を良く表していることが確認された。次に磁力線を流れの方向と垂直に設定した磁化プラズマ中での航跡構造を計算機実験解析で再現した。この場合、航跡の空間スケールに対応する波数領域ではイオンサイクロトロン高調波に伴う複数の波動ブランチが存在するため、分散特性と航跡構造の関連は自明ではない。そこで数値的に求めた各波動ブランチの分散特性との対応関係を調査したところ、得られた航跡構造は低域混成波動の分散特性を比較的良く反映していることを示唆する結果を得た。また一連の取り組みの中で磁化プラズマ中では航跡構造がより長距離に伸展する傾向があることも確認された。


• 電波利活用強靭化に向けた周波数創造技術に関する研究開発及び人材育成プログラム

  浅見 徹, 鈴木 義規, 坂野 寿和, 横山 浩之, 長谷川 晃朗, 柏木 良夫, 和泉 吉浩, 大角 一樹, 原田 博司, 正木 弘子, 山本 高至, 西尾 理志, 田谷 昭仁, 太田 真衣, 太郎丸 眞, 矢野 一人, 鈴木 健太, OJETUNDE Babatunde Segun, 水谷 圭一, 石崎 雅之, 山本 清志, 清水 聡, 浅野 勝洋, 栗原 拓哉, 岩井 誠人, 芹澤 和伸, 賀谷 信幸, 三宅 洋平, 仁田 功一, 阿野 進, 佐久間 和司, 大槻 弘幸, 酒井 靖夫, 松室 尭之

  総務省, 戦略的情報通信研究開発推進事業（SCOPE）, 電波COE研究開発プログラム, 株式会社国際電気通信基礎技術研究所, 2019 - 2022, Others


• Numerical Modeling of Space Charging Processes in Dynamically-changing Space Environment

  三宅 洋平

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Kobe University, 01 Apr. 2018 - 31 Mar. 2020, Principal investigator

  次世代太陽地球圏環境（宇宙天気）予報システムの構築に向け、衛星障害の発生確率が高いとされる地球電磁気圏じょう乱時の異常衛星帯電を、経験則ではなく物理機構に基づき予測する手法の確立が急務である。R01年度は、従来の3次元プラズマ粒子シミュレーション手法で現実的に取り扱いが可能な時間幅より、ゆっくりとした時間スケールで起こるプラズマ環境変動の効果を衛星帯電評価に取り入れるため、粒子シミュレーションと、衛星電位の時間発展方程式の数値積分を連成させる新たな帯電評価技法を提案した。 一般的に衛星電位の時間発展は、衛星に流入するプラズマ電流と衛星構体の静電容量によって記述される。プラズマ電流は衛星構体電位や形状、衛星が複数の要素から形成されている場合はそれらを接続する電気回路網、および周辺プラズマのパラメータに依存し、解析的に記述できる状況は限られている。提案手法では、衛星構体電位を制御しながら多数回のプラズマ粒子シミュレーションを実施することで、この各プラズマ電流値を決定し、衛星電位時間発展方程式の入力項として用いることにより、衛星電位の振る舞いを近似的に求める。（電位固定された衛星に対する）流入電流の緩和時間が、衛星電位自体のそれより一般的に短いため、粒子シミュレーションのみを用いる従来手法に比べて、より長期間の衛星電位評価を現実的な時間で求めることが可能である。また流入電流のプラズマ環境パラメータに対する依存性をあらかじめ調べておくことにより、宇宙環境じょう乱に対する衛星電位応答を調べる目的に使用可能である。当該提案手法を時間変動するプラズマ波動環境下の帯電評価に適用し、妥当な予測が行えることを確認した。今後宇宙環境データベースや磁気圏グローバルシミュレーションから抽出した環境変動データを入力とすることにより、地球電磁気圏じょう乱を考慮した衛星帯電評価を実現する計画である。

  Competitive research funding


• Particle Simulations on Space Plasma Interactions with Weakly-Magnetized Small Bodies

  Miyake Yohei

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Kobe University, Apr. 2017 - Mar. 2020, Principal investigator

  The plasma environments near solar-system small bodies are numerically reproduced by means of the particle-in-cell plasma simulations, assuming two independent situations of an interplanetary magnetic field line contacting the Moon surface and a near-spacecraft region in the polar ionosphere. The simulations reveal that the excitation of low frequency electromagnetic waves at 100 km away from the Moon surface, as well as the presence of the electron wing that is reflected at the spacecraft surface and guided along geomagnetic field lines. Both results provide us important clues on the presence of long-range nature of body-plasma interactions in particular conditions. The spatial scale of the disturbance identified in the present study extends to hundreds of Debye lengths of the environment, which is much longer than previously considered.

  Competitive research funding


• Spacecraft Surface Charging Model Predictions based on Interaction Processes between Spacecraft Systems and Space Weather Phenomena

  三宅 洋平

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Kobe University, 01 Apr. 2016 - 31 Mar. 2018, Principal investigator

  宇宙天気予報システムの構築に向け、太陽活動度によりダイナミックに変動するプラズマ環境と、衛星障害の原因となりうる衛星帯電現象の間の物理的相関を明らかにすることが、必要不可欠である。H29年度は、3次元の大規模プラズマ粒子シミュレーション解析を用いた広範囲のパラメータ解析により、プラズマ波動に代表される変動電磁環境が衛星帯電に及ぼす影響の特性調査を実施した。主な成果は以下の通りである。 ①宇宙プラズマ空間には、周波数、伝搬特性、偏波が異なる多様なプラズマ波動モードが存在する。本年度は、これらの波動特性に対する衛星電位の依存性を定量化するために、粒子モデルに基づく数値シミュレーションを用いたパラメータ解析を実施した。結果として、背景磁場に平行な波動電界成分を持つケースにおいて、衛星電位の上昇幅が大きくなることが確認された。また磁場に垂直な偏波面をもつ場合においては、右回り円偏波、かつ波動振動数が電子サイクロトロン周波数と一致する条件下で、特異的に顕著な衛星電位上昇が認められた。衛星近傍に存在する光電子の速度分布解析に基づき、この特異な電位上昇がサイクロトロン共鳴に伴う光電子加熱と、それに起因する衛星正電流の増大が原因であることを明らかにした。 ②科学衛星で幅広く用いられるダブルプローブ電場計測では、飛翔体から進展した、対を成すプローブ電位の差をとることで衛星帯電の影響を最小化している。しかし、ウェイク等により、衛星周辺に非対称な電位構造が形成されると、その影響は差動計測では除去されず、不要電場として観測データに混入する。本年度は、地球磁場の影響が比較的大きい電離圏プラズマ中の飛翔体後方ウェイク構造と、それがプローブ観測に及ぼす影響を調査した。結果として電子旋回運動により、非対称のウェイク構造が確認された。またそれに起因する非正弦波状の不要電場の発生を数値的に再現することに成功した。

  Competitive research funding


• Electron hybrid and MHD code cross-reference simulation for the study of radiation belt electrons in the planetary magnetospheres

  Katoh Yuto, KASAHARA Satoshi, MIYAKE Yohei, OMURA Yoshiharu, Kurth William, Menietti Doug

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Tohoku University, 01 Apr. 2015 - 31 Mar. 2018

  We studied the acceleration process of relativistic electrons in planetary radiation belts by conducting 'cross-reference' simulations. We carried out (1) the magnetohydrodynamic (MHD) code for the interaction between solar wind and planetary magnetospheres and (2) electron hybrid code simulations reproducing the generation of whistler-mode chorus emissions, which play crucial roles in the efficient acceleration process of relativistic electrons in planetary magnetospheres. Based on the simulation results, we revealed the condition required for the chorus generation in the terrestrial and Jovian magnetospheres.


• Computer-aided evaluation of air-intake systems on air breathing ion engine and its experimental verifications

  TAGAWA Masahito, NISHIYAMA Kazutaka, USUI Hideyuki, MIYAKE Yohei, TERAOKA Yuden

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Grant-in-Aid for Challenging Exploratory Research, Kobe University, 01 Apr. 2015 - 31 Mar. 2018

  The purpose of this project is to establish the design guideline of the air intake system for air breathing ion engine (ABIE) both by numerical simulations and experiments. The results of DSMC simulations show that the density of the reflected molecules are concentrated near the center axis of the ABIE. Plasma simulation performed by computational code (EMSES) indicated that the production of the ions in the ABIE increased 5 times by tuning the ABIE design. The experiments using 25% scale ABIE model was carried out. The pressure in the ABIE was measured by the fast ionization gauge. An evaluation method of air intake of ABIE in the orbit (continuous atomic oxygen flow) was successfully established based on the ground-based experiment using beam pulses formed in the laser-detonation beam source.


• Large-Scale Particle Simulations on Spacecraft Interactions with Extreme Space Plasma Environment

  MIYAKE Yohei, USUI Hideyuki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Kobe University, 01 Apr. 2013 - 31 Mar. 2015, Principal investigator

  We study the scientific spacecraft interactions with near-Sun plasma environment via three-dimensional electromagnetic plasma particles simulations. The major results of the present study are summarized as below, and the obtained knowledge is applicable to future scientific spacecraft design. 1. Although a large flux of photoelectrons is emitted from s spacecraft, the spacecraft in near-Sun environment charges negatively due to space-charge effects associated with the emitted electrons. 2. The photoelectron distribution shows clear asymmetry near the spacecraft due to an ambient electric field associated with the plasma convection. This environmental asymmetry results in an intense spurious electric field of 100 mV/m. 3. The large flux of photoelectrons causes local magnetic perturbation around the spacecraft, which is in the order of a few nT.

  Competitive research funding


• 三次元電磁粒子モデル計算機実験による宇宙飛翔体プラズマ電磁環境の研究

  三宅 洋平

  日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 特別研究員奨励費, 京都大学, 2006 - 2008

  本研究の目的は、衛星・プラズマ間相互作用によって変化する宇宙プラズマ電磁環境が、衛星に搭載された波動観測用アンテナ特性に及ぼす影響を、粒子モデル計算機実験により評価・解析することである。 平成20年度は、将来磁気圏探査衛星ミッションにおいて広く適用が期待されるパック式電界アンテナの数値モデリングと特性解析を行った。特に、太陽光照射によって衛星筐体から放出される光電子が、電界計測に及ぼす影響を軽減するために設けられるガード電極・バイアス電流回路の数値モデルを開発し、実際の動作を模擬可能であることが確認された。上記の機構は主に定常電場計測用に最適化されているため、波動電界に対する振る舞いや性能を調査する必要がある。 開発した数値モデルを用い、計算機実験解析を行ったところ、上記機構はアンテナ周辺の定常プラズマ環境、特に光電子の空間分布を大きく変化させることがわかった。しかし、波動受信時のアンテナ特性としては、実効長・インピーダンスともに上記機構の顕著な影響は見られなかった。一方で、多数の導体要素から構成されるパック式アンテナでは、先端のセンサー以外の導体要素からの放出光電子による、アンテナインピーダンス特性変化が見出された。以上の結果から、本計算機実験手法が複雑な光電子環境中でのアンテナ特性定量評価において有力であるとともに、数値ツールとしてガード電極やバイアス電流回路の最適設計にも貢献可能であることが示された。