Electron accelerations associated with magnetic turbulence in high-Mach-number collision-less shocks

• Project/Area Number: 26400266
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Chiba University
• Principal Investigator: Matsumoto Yosuke 千葉大学, 大学院理学研究科, 特任准教授 (20397475)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 宇宙線加速 / 衝撃波 / プラズマ / ＰＩＣシミュレーション / 乱流リコネクション / 大規模数値計算 / 無衝突衝撃波 / 磁気乱流 / 磁気リコネクション / PICシミュレーション / 衝撃波加速 / 電子加速 / 宇宙線 / 電子

Outline of Final Research Achievements

We have examined multidimensional structures of high-Mach-number shocks by means of ab initio particle-in-cell simulations using the supercomputer K. We found that large-amplitude electrostatic waves at the leading edge and the magnetic turbulence in the transition layer coexist in such a strong-shock structure. In particular, spontaneous turbulent reconnection in the transition layer was found to be important for energizing electrons under sufficiently high Mach number condition (Matsumoto et al., Science, 2015). Recent 3D simulations also revealed a stochastic drift acceleration to be essentially important for producing relativistic electrons.

Research Products

• [Journal Article] A Possible Time-Delayed Brightening of the Sgr A* Accretion Flow after the Pericenter Passage of G2 Cloud (2017)
  • Author(s): Tomohisa Kawashima, Yosuke Matsumoto, and Ryoji Matsumoto
  • Journal Title: Publ. Astron. Soc. Japan Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Model Experiment of Magnetic Field Amplification in Laser-Produced plasmas via the Richtmyer-Meshkov instability (2016)
  • Author(s): Y. Kuramitsu, N. Ohnishi, Y. Sakawa, T. Morita, H. Tanji, T. Ide, K. Nishio, C. D. Gregory, J. N. Waugh, N. Booth, R. Heathcote, C. Murphy, G. Gregori, J. Smallcombe, C. Barton, A. Diziere, M. Koenig, N. Woolsey, A Mizuta, T. Sugiyama, S. Matsukiyo, T. Moritaka, T. Sano, and H. Takabe
  • Journal Title: Physics of Plasmas Volume: 23 Issue: 3 Pages: 032126-032126
  • DOI: 10.1063/1.4944925
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] TIME EVOLUTION of KELVIN-HELMHOLTZ VORTICES ASSOCIATED with COLLISIONLESS SHOCKS in LASER-PRODUCED PLASMAS (2016)
  • Author(s): Y. Kuramitsu, A. Mizuta, Y. Sakawa, H. Tanji, T. Ide, T. Sano, M. Koenig, A. Ravasio, A. Pelka, H. Takabe, C. D. Gregory, N. Woolsey, T. Moritaka, S. Matsukiyo, Y. Matsumoto, and N. Ohnishi
  • Journal Title: The Astrophysical Journal Volume: 828 Issue: 2 Pages: 93-93
  • DOI: 10.3847/0004-637x/828/2/93
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Stochastic electron acceleration during spontaneous turbulent reconnection in a strong shock wave, (2015)
  • Author(s): Y. Matsumoto, T. Amano, T. Kato, and M. Hoshino
  • Journal Title: Science Volume: 347 Issue: 6225 Pages: 974-978
  • DOI: 10.1126/science.1260168
  • Peer Reviewed
• [Presentation] 高マッハ数衝撃波における電子のサーフィン・ドリフト加速 (2017)
  • Author(s): 松本洋介、天野孝伸、加藤恒彦、星野真弘
  • Organizer: 日本天文学会年会
  • Place of Presentation: 九州大学（福岡県・福岡市）
• [Presentation] Magnetic reconnection in astrophysical shock waves (2016)
  • Author(s): Y. Matsumoto, T. Amano, T. N. Kato, and M. Hoshino
  • Organizer: The US-Japan Workshop on Magnetic Reconnection
  • Place of Presentation: Andaz Napa (California, USA)
  • Year and Date: 2016-03-07
  • Int'l Joint Research / Invited
• [Presentation] Stochastic electron acceleration during turbulent reconnection in strong shock waves (2016)
  • Author(s): Yosuke Matsumoto
  • Organizer: EGU General Assembly 2016
  • Place of Presentation: Vienna, Austria
  • Int'l Joint Research / Invited
• [Presentation] マジックCFL法を用いた相対論的衝撃波の長時間計算 (2016)
  • Author(s): 松本洋介、池谷直樹
  • Organizer: 日本地球惑星科学連合連合大会2016年大会
  • Place of Presentation: 幕張メッセ（千葉県・千葉市）
• [Presentation] Three-dimensional structures of high-MA shocks and associated electron accelerations (2016)
  • Author(s): Y. Matsumoto, T. Amano, T. N. Kato, and M. Hoshino
  • Organizer: 6th East-Asia School and Workshop on Laboratory, Space, and Astrophysical Plasma
  • Place of Presentation: Epochal Tsukuba（茨城県・つくば市）
  • Int'l Joint Research / Invited
• [Presentation] Prolonged electron accelerations at a high Mach-number quasi-perpendicular shock (2016)
  • Author(s): Y. Matsumoto, T. Amano, T. N. Kato, and M. Hoshino
  • Organizer: AGU Fall meeting
  • Place of Presentation: San Francisco, USA
  • Int'l Joint Research
• [Presentation] Supercomputing for exploring electron accelerations at high-Mach-number collisionless shocks (2015)
  • Author(s): Yosuke Matsumoto
  • Organizer: Workshop on Supernovae and Their Remnants
  • Place of Presentation: ISAS (Sagamihara, Japan)
  • Year and Date: 2015-11-09
  • Int'l Joint Research / Invited
• [Presentation] Supercomputing for exploring electron accelerations in strong shock waves (2015)
  • Author(s): Yosuke Matsumoto
  • Organizer: ISSI team meeting
  • Place of Presentation: ISSI (Bern, Switzerland)
  • Year and Date: 2015-06-02
  • Int'l Joint Research / Invited
• [Presentation] Supercomputing for exploring electron accelerations in strong shock waves (2015)
  • Author(s): Yosuke Matsumoto
  • Organizer: The 9th International West Lake Symposium
  • Place of Presentation: Liutong Hotel (Hangzhou, China)
  • Year and Date: 2015-05-18
  • Int'l Joint Research / Invited
• [Presentation] Supercomputing for exploring electron accelerations in strong shock waves (2015)
  • Author(s): Yosuke Matsumoto, Takanobu Amano, Tsunehiko Kato, and Masahiro Hoshino
  • Organizer: The 1st Conference on Laser Energetics
  • Place of Presentation: Pacifico Yokohama (Yokohama, Japan)
  • Year and Date: 2015-04-24
  • Int'l Joint Research / Invited
• [Presentation] 高マッハ数衝撃波における磁気リコネクション誘発と電子加速 (2015)
  • Author(s): 松本洋介、天野孝伸、加藤恒彦、星野真弘
  • Organizer: 日本天文学会年会
  • Place of Presentation: 大阪府豊中市大阪大学
  • Year and Date: 2015-03-20
• [Presentation] 高マッハ数衝撃波における磁気リコネクション誘発と電子加速 (2014)
  • Author(s): 松本洋介、天野孝伸、加藤恒彦、星野真弘
  • Organizer: 日本地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 長野県松本市キッセイ文化ホール
  • Year and Date: 2014-11-01