Establishing Theory of Electron Acceleration at Shocks Based on In-situ Observation
| Project/Area Number |
17H02966
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Amano Takanobu 東京大学, 大学院理学系研究科(理学部), 准教授 (00514853)
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| Co-Investigator(Kenkyū-buntansha) |
松清 修一 九州大学, 総合理工学研究院, 准教授 (00380709)
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2019: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2018: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
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| Keywords | プラズマ / 粒子加速 / 衝撃波 / プラズマ波動 / 宇宙線 / 数値シミュレーション |
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| Outline of Final Research Achievements |
The efficiency of electron acceleration at shocks in space was investigated by combining theory, observational data analysis, as well as numerical simulations. A new theoretical model for acceleration of sub-relativistic electrons was proposed, which explains spacecraft observations of Earth’s bow shock. First-principles numerical simulations have also been conducted to investigate the effect of non-stationarity and survey the parameter dependence for application to shocks in various space environments. Judging from the obtained results, the model proposed in this research may be considered as the most promising candidate to resolve the long-standing issue of electron injection in the shock acceleration theory.
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| Academic Significance and Societal Importance of the Research Achievements |
高エネルギー粒子の加速は宇宙において普遍的に見られる現象であり，一部の粒子のみが熱的エネルギーよりも遥かに高いエネルギーまで加速されることが知られている．熱平衡状態から大きく逸脱した粒子を生成する機構として，最も有力視されているのが衝撃波における粒子加速機構である．本研究によって衝撃波粒子加速における最大の困難であった電子注入問題の解決に向けて大きな一歩を踏み出すことができた
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Report
(5 results)
Research Products
(51 results)
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[Journal Article] Electron Scattering by Low-Frequency Whistler Waves at Earth's Bow Shock2019
Author(s)
M. Oka, F. Otsuka, S. Matsukiyo, L. B. Wilson III, M. R. Argall, T. Amano, T. D. Phan, M. Hoshino, O. Le Contel, D. J. Gershman, J. L. Burch, R. B. Torbert, J. C. Dorelli, B. L. Giles, R. E. Ergun, C. T. Russell, and P. A. Lindqvist
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Journal Title
Astrophysical Journal
Volume: 886
Issue: 1
Pages: 53-53
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Ion energies dominating energy density in the inner magnetosphere: Spatial distributions and composition, observed by Arase/MEP-i2018
Author(s)
Keika, K. S. Kasahara, S. Yokota, M. Hoshino, K. Seki, M. Nose, T. Amano, Y. Miyoshi, and I. Shinohara,
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Journal Title
Geophysical Research Letters
Volume: 45
Issue: 22
Pages: 12153-12162
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] A statistical study of slow-mode shocks observed by MMS in the dayside magnetopause2018
Author(s)
Walia, N. K., K. Seki, M. Hoshino, T. Amano, N. Kitamura, Y. Saito, S. Yokota, C. J. Pollock, B. L. Giles, T. E. Moore, R. B. Torbert, C. T. Russell, and J. L. Burch
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Journal Title
Geophys. Res. Lett.
Volume: 45
Issue: 10
Pages: 4675-4684
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Theory, modeling, and integrated studies in the Arase (ERG) project2018
Author(s)
Seki Kanako、Miyoshi Yoshizumi、Ebihara Yusuke、Katoh Yuto、Amano Takanobu、Saito Shinji、Shoji Masafumi、Nakamizo Aoi、Keika Kunihiro、Hori Tomoaki、Nakano Shin’ya、Watanabe Shigeto、Kamiya Kei、Takahashi Naoko、Omura Yoshiharu、Nose Masahito、Fok Mei-Ching、Tanaka Takashi、Ieda Akimasa、Yoshikawa Akimasa
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Journal Title
Earth, Planets and Space
Volume: 70
Issue: 1
Pages: 17-17
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] MMS observation of stochastic shock drift acceleration of electrons2019
Author(s)
Amano, T., Katou, T., Kitamura, N., Oka, M., Matsumoto, Y., Hoshino, M., Saito, Y., Yokota, S., Giles, B. L., Paterson, W. R., Russel, C. T., Le Contel, O., Ergun, R. E., Lindqvist, P.-A., Turner, D. L., Fennell, J. F. Blake, J. B.
Organizer
GEM summer workshop 2019
Related Report
Int'l Joint Research
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[Presentation] Observational Evidence for Stochastic Shock Drift Acceleration at Quasi-perpendicular Earth’s Bow Shock2019
Author(s)
Amano, T., Katou, T., Kitamura, N., Oka, M., Matsumoto, Y., Hoshino, M., Saito, Y., Yokota, S., Giles, B. L., Paterson, W. R., Russel, C. T., Le Contel, O., Ergun, R. E., Lindqvist, P.-A., Turner, D. L., Fennell, J. F. Blake, J. B.
Organizer
EASW9 (9th East-Asia School and Workshop on Laboratory, Space, and Astrophysical Plasmas)
Related Report
Int'l Joint Research
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[Presentation] MMS Observation of Stochastic Shock Drift Acceleration of Non-thermal Electron at Quasi-perpendicular Bow Shock2019
Author(s)
Amano, T., Katou, T., Kitamura, N., Oka, M., Matsumoto, Y., Hoshino, M., Saito, Y., Yokota, S., Giles, B. L., Paterson, W. R., Russel, C. T., Le Contel, O., Ergun, R. E., Lindqvist, P.-A., Turner, D. L., Fennell, J. F. Blake, J. B.
Organizer
AGU fall meeting
Related Report
Int'l Joint Research
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[Presentation] Nonthermal Electron Acceleration at Earth’s Bow Shock: Theory, Simulation and Observation2018
Author(s)
Amano, T., Katou, N., Kitamura, N., Matsumoto, Y., Oka, M., Hoshino, M.
Organizer
ISSS-13 (The 13th International School/Symposium for Space Simulations)
Related Report
Int'l Joint Research / Invited
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[Presentation] Three-dimensional Particle-In-Cell Simulations for High Mach Number Collisionless Shocks2018
Author(s)
Amano, T., Katou, N., Kitamura, N., Matsumoto, Y., Oka, M., Hoshino, M.
Organizer
AAPPS-DPP 2018 (2nd Asia-Pacific Conference on Plasma Physics)
Related Report
Int'l Joint Research / Invited
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