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Study of fast magnetic reconnection with multi-scale plasma magnet-hydrodynamic simulations

Research Project

Project/Area Number 15540475
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Plasma science
Research InstitutionEhime University

Principal Investigator

SHIMIZU Tohru  Ehime University, Graduate School of Science and Engineering, Associate professor, 大学院理工学研究科, 助教授 (60196524)

Co-Investigator(Kenkyū-buntansha) UGAI Masayuki  Ehime University, Graduate School of Science and Engineering, Professor, 大学院理工学研究科, 教授 (10036444)
KONDO Koji  Ehime University, Graduate School of Science and Engineering, Researcher, 大学院理工学研究科, 助手 (30304653)
Project Period (FY) 2003 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsfast magnetic reconnection / magnet-hydrodynamic / numerical simulation / 磁気再結合 / 二流体問題 / 異常電気抵抗 / マルチスケール / plasma / fast magnetic reconnection / MHD simulation / hall effect / adiabatic expansion acceleration / fast shock
Research Abstract

Fast magnetic reconnection is an explosive energy conversion mechanism in plasma, by which the magnetic energy is converted to the plasma kinetic energy. With recent space satellite observations, fast magnetic reconnection is considered to play a crucial role in solar flares and geomagnetic substorms. The major difficulty of the plasma physics is that the mechanisms of many phenomena are controlled through coupling of more than two basic mechanisms in an extremely wide range of space and time, i.e. from the gyration motion of electron to interplanetary space. In this study, in order to research the fast magnetic reconnection process, some multi-scale plasma simulation codes were developed and the existence of the Petschek type fast reconnection model was tried to be examined by the numerical simulations. The followings were revealed.
1: On the basis of MHD (Magneto-hydrodynamic) theoretical study, the propagation speed of plasmoids ejected from the fast magnetic reconnection region is u … More niquely controlled by the upstream plasma beta value and the opening angle of the slow shock around the plasmoid.
2: On the basis of MHD multi-scale simulation code, two-dimensional fast magnetic reconnection is unstable for a small amount of perturbations in the sheet-current direction and is spontaneously developed to three-dimensional fast magnetic reconnection which is strongly localized in the sheet current direction. And, the reconnection process is intermittently repeated and continues to randomly eject the three-dimensional plasmoids. This simulation result seems to be consistent with plasma downflowing phenomena in solar flares detected in TRACE satellite observations.
3: The combination of the MHD and particle (kinetic) simulation codes was also studied. The code itself was constructed and it was revealed that the code is very useful to save the computer memory to simultaneously simulate the electron-ion behaviors at the magnetic neutral point and the MHD behaviors around there. But, the computational speed is still insufficient to examine the full simulation for the fast magnetic reconnection. The development of the simulation code is continued. Less

Report

(5 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (21 results)

All 2006 2005 2004 2003 Other

All Journal Article (18 results) Publications (3 results)

  • [Journal Article] Adiabatic expansion acceleration process in spontaneous fast magnetic reconnection2006

    • Author(s)
      T.Shimizu, K.Kondo, M.Ugai
    • Journal Title

      Advances in Space Research Vol. 37

      Pages: 1283-1286

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Three dimensional computer simulation of magnetic loop associated with magnetic reconnection2006

    • Author(s)
      K.Kondo, M.Ugai, T.Shimizu
    • Journal Title

      Advances in Space Research Vol. 37

      Pages: 1301-1304

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Adiabatic expansion acceleration process in spontaneous fast magnetic reconnection2006

    • Author(s)
      T.Shimizu, K.Kondo, M.Ugai
    • Journal Title

      Advances in Space Research Vol.37

      Pages: 1283-1286

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Three dimensional computer simulation of magnetic loop associated with magnetic reconnection2006

    • Author(s)
      K.Kondo, M.Ugai, T.Shimizu
    • Journal Title

      Advances in Space Research Vol.37

      Pages: 1301-1304

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Three dimensional computer simulation of magnetic loop associated with magnetic reconnection2006

    • Author(s)
      K.Kondoh, M.Ugai, T.Shimizu
    • Journal Title

      Adv.Space Research 37

      Pages: 1301-1304

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Adiabatic expansion acceleration process in pontaneous fast magnetic reconnection2006

    • Author(s)
      T.Shimizu, K.Kondoh, M.Ugai
    • Journal Title

      Adv.Space Research 37

      Pages: 1283-1286

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Spontaneous fast reconnection model in three dimensions2005

    • Author(s)
      M.Ugai, K.Kondo, T.Shimizu
    • Journal Title

      Physics of Plasmas Vol. 12

      Pages: 42903-42903

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] SUPERSONIC AND SUBSONIC EXPANSION ACCELERATION MECHANISM IN FAST MAGNETIC RECONNECTION2005

    • Author(s)
      T.Shimizu, M.Ugai
    • Journal Title

      COSPAR Colloquia Series Vol. 16

      Pages: 139-142

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Spontaneous fast reconnection model in three dimensions2005

    • Author(s)
      M.Ugai, K.Kondo, T.Shimizu
    • Journal Title

      Physics of Plasmas Vol.12

      Pages: 42903-42903

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] SUPERSONIC AND SUBSONIC EXPANSION ACCELERATION MECHANISM IN FAST MAGNETIC RECONNECTION2005

    • Author(s)
      T.Shimizu, M.Ugai
    • Journal Title

      COSPAR Colloquia Series Vol.16

      Pages: 139-142

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Comparison of supersonic and subsonic expansion accelerations associated with fast magnetic reconnection2005

    • Author(s)
      T.Shimizu, M.Ugai
    • Journal Title

      Advances in Space Research Vol.33

      Pages: 789-793

    • Related Report
      2005 Annual Research Report
  • [Journal Article] MHD shock wave structure in supersonic magnetic reconnection2005

    • Author(s)
      T.Shimizu, K.Kondo, M.Ugai
    • Journal Title

      Proc.of the International Scientific Conf.on Chromospheric and Coronal Magnetic Fields ESA SP-596

      Pages: 4-4

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Computer studies on the three-dimensional spontaneous fast reconnection model as a nonlinear instability2004

    • Author(s)
      M.Ugai, K.Kondoh, T.Shimizu
    • Journal Title

      Physics of Plasmas Vol. 4

      Pages: 1416-1423

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Computer studies on the three-dimensional spontaneous fast reconnection model as a nonlinear instability2004

    • Author(s)
      M.Ugai, K.Kondoh, T.Shimizu
    • Journal Title

      Physics of Plasmas Vol.4

      Pages: 1416-1423

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Comparison of supersonic and subsonic expansion accelerations associated with fast magnetic reconnection2004

    • Author(s)
      T.Shimizu, M.Ugai
    • Journal Title

      Advances in Space Research 33

      Pages: 789-793

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Supersonic and subsonic expansion acceleration mechanism in fast magnetic reconnection2004

    • Author(s)
      T.Shimizu, M.Ugai
    • Journal Title

      Cospar Colloquia Series, Frontiers in Magnetospheric Plasma Physics 16

      Pages: 139-142

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Magnethydrodynamic study of adiabatic supersonic and subsonic expansion accelerations in spontaneous fast magnetic reconnection2003

    • Author(s)
      T.Shimizu, M.Ugai
    • Journal Title

      Physics of Plasmas Vol. 10

      Pages: 921-929

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Magnethydrodynamic study of adiabatic supersonic and subsonic expansion accelerations in spontaneous fast magnetic reconnection2003

    • Author(s)
      T.Shimizu, M.Ugai
    • Journal Title

      Physics of Plasmas Vol.10

      Pages: 921-929

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Publications] T.Shimizu, M.Ugai: "Magnetohydrodynamic study of adiabatic supersonic and subsonic expansion accelerations in spontaneous fast magnetic reconnection"Physics of Plasmas. Vol.10, No.4. 921-929 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Shimizu, M.Ugai: "Comparison of supersonic and subsonic expansion accelerations associated with fast magnetic reconnection"Advances in Space Research. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Ugai, K.Kondoh, T.Shimizu: "Computer studies on the three dimensional spontaneous fast reconnection model as a nonlinear instability"Physics of Plasmas. Vol.11, No.4(印刷中). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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