• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Magnetic Reconnection under a Relativistic Drift Current

Research Project

Project/Area Number 20K20908
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 14:Plasma science and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Hoshino Masahiro  東京大学, 大学院理学系研究科(理学部), 教授 (90241257)

Project Period (FY) 2020-07-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords宇宙プラズマ / 磁気リコネクション / 粒子加速 / プラズマ加熱 / 相対論的プラズマ / 粒子シミュレーション / 高エネルギー天体 / 相対論プラズマ / パルサー風 / 非線形 / 無衝突プラズマ
Outline of Research at the Start

磁気リコネクションは、磁場の極性が反転する電流層に閉じ込められたプラズマが磁力線のつなぎ替えにより起きる不安定で、磁場エネルギーを熱エネルギーや運動エネルギーに効率よく変換するメカニズムである。リコネクションは、太陽フレアや地球磁気圏サブストームなどの磁気爆発現象の解明や、核融合プラズマでのディスラプション現象を制御する物理過程として数多くの研究がなされてきている。またパルサー磁気圏やマグネター、宇宙ジェット等の相対論的高温プラズマでの現象の理解にも欠かせない物理機構として注目されている。本研究では、プラズマシートの電流のドリフト速度が光速に近くなる場合の磁気リコネクションについて研究する。

Outline of Final Research Achievements

Magnetic reconnection has been studied for more than 70 years as a ubiquitous plasma process that converts magnetic field energy into plasma kinetic energy, and recently its scope has been extended to the relativistic plasma regime, including applications to high-energy astronomical phenomena. Two different aspects of relativistic reconnection, relativistic high temperature plasmas and relativistic high drift velocity, have been investigated in this research project. In the first half of the research period, we studied the dependence on the drift speed and found that the growth rate decreases when the drift speed asymptotically approaches the speed of light and the Lorentz factor exceeds about 2. In the second half of the research period, the energy partitioning problem of relativistic reconnection was studied in terms of the efficiency of thermal plasma production and non-thermal particle acceleration.

Academic Significance and Societal Importance of the Research Achievements

磁気リコネクションの研究は、磁場のトポロジー変化に伴い磁場エネルギーを急激に解放するメカニズムとして、実験室プラズマから宇宙プラズマまで数多くの研究が行われてきている。本研究は、極限宇宙を解明するために欠かせないリコネクションによる磁気エネルギー散逸率および散逸した結果のエネルギー分配問題に焦点を当てて研究を行った。パルサー磁気圏やブラックホール磁気圏を始めとする高エネルギー天体のプラズマ環境を理解するうえで重要な結果を得た。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (27 results)

All 2024 2023 2022 2021 2020

All Journal Article (19 results) (of which Int'l Joint Research: 16 results,  Peer Reviewed: 18 results,  Open Access: 15 results) Presentation (8 results) (of which Int'l Joint Research: 8 results,  Invited: 7 results)

  • [Journal Article] Linearly Polarized Coherent Emission from Relativistic Magnetized Ion-Electron Shocks2024

    • Author(s)
      Iwamoto Masanori、Matsumoto Yosuke、Amano Takanobu、Matsukiyo Shuichi、Hoshino Masahiro
    • Journal Title

      Physical Review Letters

      Volume: 132 Issue: 3 Pages: 035201-035201

    • DOI

      10.1103/physrevlett.132.035201

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Energy Partition of Thermal and Nonthermal Particles in Magnetic Reconnection2023

    • Author(s)
      Hoshino Masahiro
    • Journal Title

      The Astrophysical Journal

      Volume: 946 Issue: 2 Pages: 77-77

    • DOI

      10.3847/1538-4357/acbfb5

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Electron?Ion Temperature Ratio in Astrophysical Shocks2023

    • Author(s)
      Raymond John C.、Ghavamian Parviz、Bohdan Artem、Ryu Dongsu、Niemiec Jacek、Sironi Lorenzo、Tran Aaron、Amato Elena、Hoshino Masahiro、Pohl Martin、Amano Takanobu、Fiuza Frederico
    • Journal Title

      The Astrophysical Journal

      Volume: 949 Issue: 2 Pages: 50-50

    • DOI

      10.3847/1538-4357/acc528

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Nonthermal electron acceleration at collisionless quasi-perpendicular shocks2022

    • Author(s)
      Amano Takanobu、Matsumoto Yosuke、Bohdan Artem、Kobzar Oleh、Matsukiyo Shuichi、Oka Mitsuo、Niemiec Jacek、Pohl Martin、Hoshino Masahiro
    • Journal Title

      Reviews of Modern Plasma Physics

      Volume: 6 Issue: 1 Pages: 29-29

    • DOI

      10.1007/s41614-022-00093-1

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Fully Kinetic (Particle-in-Cell) Simulation of Astrophysical Plasmas2022

    • Author(s)
      Hoshino Masahiro
    • Journal Title

      Space and Astrophysical Plasma Simulation: Methods, Algorithms, and Applications

      Volume: - Pages: 337-357

    • DOI

      10.1007/978-3-031-11870-8_11

    • ISBN
      9783031118692, 9783031118708
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Global Characteristics of Cold Protons Around Midnight in the Magnetotail: Implication for Efficient Heating and Origin2022

    • Author(s)
      Keika K.、Asami R.、Hoshino M.、Fuselier S. A.
    • Journal Title

      Journal of Geophysical Research: Space Physics

      Volume: 127 Issue: 7 Pages: 1-15

    • DOI

      10.1029/2021ja029576

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Direct observations of pure electron outflow in magnetic reconnection2022

    • Author(s)
      Sakai K.、Moritaka T.、Morita T.、Tomita K.、Minami T.、Nishimoto T.、Egashira S.、Ota M.、Sakawa Y.、Ozaki N.、Kodama R.、Kojima T.、Takezaki T.、Yamazaki R.、Tanaka S. J.、Aihara K.、Koenig M.、Albertazzi B.、Mabey P.、Woolsey N.、Matsukiyo S.、Takabe H.、Hoshino M.、Kuramitsu Y.
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 1-9

    • DOI

      10.1038/s41598-022-14582-3

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Efficiency of nonthermal particle acceleration in magnetic reconnection2022

    • Author(s)
      Hoshino Masahiro
    • Journal Title

      Physics of Plasmas

      Volume: 29 Issue: 4 Pages: 042902-042902

    • DOI

      10.1063/5.0086316

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Nonlinear explosive magnetic reconnection in a collisionless system2021

    • Author(s)
      Hoshino Masahiro
    • Journal Title

      Physics of Plasmas

      Volume: 28 Issue: 6 Pages: 062106-062106

    • DOI

      10.1063/5.0050389

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Electron Acceleration at Rippled Low-mach-number Shocks in High-beta Collisionless Cosmic Plasmas2021

    • Author(s)
      Kobzar Oleh、Niemiec Jacek、Amano Takanobu、Hoshino Masahiro、Matsukiyo Shuichi、Matsumoto Yosuke、Pohl Martin
    • Journal Title

      The Astrophysical Journal

      Volume: 919 Issue: 2 Pages: 97-97

    • DOI

      10.3847/1538-4357/ac1107

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mildly relativistic magnetized shocks in electron-ion plasmas - II. Particle acceleration and heating2021

    • Author(s)
      Ligorini Arianna、Niemiec Jacek、Kobzar Oleh、Iwamoto Masanori、Bohdan Artem、Pohl Martin、Matsumoto Yosuke、Amano Takanobu、Matsukiyo Shuichi、Hoshino Masahiro
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 502 Issue: 4 Pages: 5065-5074

    • DOI

      10.1093/mnras/stab220

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Pre-flight Calibration and Near-Earth Commissioning Results of the Mercury Plasma Particle Experiment (MPPE) Onboard MMO (Mio)2021

    • Author(s)
      Y. Saito, D. Delcourt, M. Hirahara S. Barabash, N. Andre, T. Takashima, K. Asamura, S. Yokota et al.o, M. Fujimoto, N. Terada, K. Keika, BepiColombo Mio/MPPE Team
    • Journal Title

      Space Science Reviews

      Volume: 217 Issue: 5 Pages: 70-70

    • DOI

      10.1007/s11214-021-00839-2

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Particle energization in space plasmas: towards a multi-point, multi-scale plasma observatory2021

    • Author(s)
      A Retino, Y Khotyaintsev, O Le Contel, MF Marcucci et al.
    • Journal Title

      Experimental Astronomy

      Volume: - Issue: 2-3 Pages: 427-471

    • DOI

      10.1007/s10686-021-09797-7

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Stabilization of Magnetic Reconnection in the Relativistic Current Sheet2020

    • Author(s)
      Hoshino Masahiro
    • Journal Title

      The Astrophysical Journal

      Volume: 900 Issue: 1 Pages: 66-66

    • DOI

      10.3847/1538-4357/aba59d

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nonthermal electron and ion acceleration by magnetic reconnection in large laser-driven plasmas2020

    • Author(s)
      Totorica S. R.、Hoshino M.、Abel T.、Fiuza F.
    • Journal Title

      Physics of Plasmas

      Volume: 27 Issue: 11 Pages: 112111-112111

    • DOI

      10.1063/5.0021169

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Observational Evidence for Stochastic Shock Drift Acceleration of Electrons at the Earth’s Bow Shock2020

    • Author(s)
      Amano T.、Katou T.、Kitamura N.、Oka M.、Matsumoto Y.、Hoshino M.、Saito Y.、Yokota S.、Giles B. L.、Paterson W.?R.、Russell C. T.、Le Contel O.、Ergun R. E.、Lindqvist P.-A.、Turner D. L.、Fennell J. F.、Blake J. B.
    • Journal Title

      Physical Review Letters

      Volume: 124 Issue: 6 Pages: 065101-065101

    • DOI

      10.1103/physrevlett.124.065101

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Transport Ratios of the Kinetic Alfv?n Mode in Space Plasmas2020

    • Author(s)
      Narita Yasuhito、Roberts Owen Wyn、V?r?s Zolt?n、Hoshino Masahiro
    • Journal Title

      Frontiers in Physics

      Volume: 8

    • DOI

      10.3389/fphy.2020.00166

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Kinetic Simulation of Nonrelativistic Perpendicular Shocks of Young Supernova Remnants. IV. Electron Heating2020

    • Author(s)
      Bohdan Artem、Pohl Martin、Niemiec Jacek、Morris Paul J.、Matsumoto Yosuke、Amano Takanobu、Hoshino Masahiro
    • Journal Title

      The Astrophysical Journal

      Volume: 904 Issue: 1 Pages: 12-12

    • DOI

      10.3847/1538-4357/abbc19

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The BepiColombo?Mio Magnetometer en Route to Mercury2020

    • Author(s)
      Baumjohann W.、Matsuoka A.et al.
    • Journal Title

      Space Science Reviews

      Volume: 216 Issue: 8 Pages: 125-125

    • DOI

      10.1007/s11214-020-00754-y

    • Related Report
      2020 Research-status Report
  • [Presentation] Energy Partitioning of Thermal and Nonthermal Plasmas in Various Magnetic Reconnection Environments2023

    • Author(s)
      Masahiro Hoshino
    • Organizer
      American Geophysical Union, Fall Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Energy partition of thermal and nonthermal particles for a composed spectrum of Maxwellian and kappa distribution function in magnetic reconnection2023

    • Author(s)
      Masahiro Hoshino
    • Organizer
      International Conference on Statistical Physics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Nonthermal particle acceleration and energy partitioning of thermal and nonthermal particles in collisionless plasma universe2023

    • Author(s)
      Masahiro Hoshino
    • Organizer
      International Conference on Statistical Physics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Energy Partition of Thermal and Nonthermal Plasmas in Magnetic2023

    • Author(s)
      Masahiro Hoshino
    • Organizer
      MR2023 Workshop on Magnetic Reconnection
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Nonlinear explosive magnetic reconnection in collisionless plasma2022

    • Author(s)
      M. Hoshino
    • Organizer
      COSPAR
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Reconnection in astrophysical plasma, particle acceleration2022

    • Author(s)
      M. Hoshino
    • Organizer
      ISSI/Bern workshop on magnetic reconnection; explosive energy conversion in space plasmas
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Efficiency of nonthermal particle acceleration from non-relativistic to relativistic magnetic reconnection,2022

    • Author(s)
      M. Hoshino
    • Organizer
      US-Japan workshop on magnetic reconnection
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Nonlinear explosive magnetic reconnection2021

    • Author(s)
      Masahiro Hoshino
    • Organizer
      URSI GASS 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited

URL: 

Published: 2020-08-03   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi