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2002 Fiscal Year Final Research Report Summary

Magnetohydrodynamic and electromagnetic-particle simulations on the spontaneous fast magnetic reconnection model

Research Project

Project/Area Number 11440146
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionEhime University

Principal Investigator

UGAI Masayuki  Ehime University, Faculty of Engineering, Professor, 工学部, 教授 (10036444)

Co-Investigator(Kenkyū-buntansha) KONDOH Koji  Ehime University, Faculty of Engineering, Instructors, 工学部, 助手 (30304653)
MURATA Takeshi  Ehime University, Faculty of Engineering, Assistant Professor, 工学部, 講師 (20274342)
SHIMIZU Tohru  Ehime University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60196524)
OMURA Yoshiharu  Kyoto University, RASC, Professor, 宙空電波科学研究センター, 教授 (50177002)
MATSUMOTO Hiroshi  Kyoto University, RASC, Professor, 宙空電波科学研究センター, 教授 (00026139)
Project Period (FY) 1999 – 2002
Keywordsmagnetic reconnection / magnetohydrodynamics / fluid and particle computer simulations / substorms / flares / space plasmas / anomalous resistivity / slow and fast shocks
Research Abstract

We have proposed the spontaneous fast reconnection model, and its basic physical mechanism has been studied by precise computer simulations. It has been definitely demonstrated in a variety of physical situations that the fast reconnection mechanism involving standing slow shocks can drastically evolve because of the positive feedback between the (microscopic) anomalous resistivity in the reconnection region and the global reconnection flow, so that the spontaneous fast reconnection evolution is considered to be a nonlinear instability of the long current sheet system. It is shown that a large-scale magnetic loop formation with a fast shock standing just ahead of the loop top directly results from this theoretical model ; also, a large-scale plasmoid is formed and propagates outwards. Recently, the simulation models are extended to three dimensions, and the detailed 3D features of the spontaneous fast reconnection model have been clarified.

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] T.Shimizu, M.Ugai: "Magnetohydrodynamic study of adiabatic supersonic and subsonic expansion accelerations in spontaneous fast magnetic reconnection"Phys. Plasmas. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ugai, K.Kondoh, T.Shimizu: "Computer simulations on three-dimensional magnetic loop dynamics by the spontaneous fast reconnection"Phys. Plasmas. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ugai, T.Shimizu: "Computer studies on the spontaneous fast reconnection evolution in a force-free current sheet system"Phys. Plasmas. Vol.9, No.3. 816-823 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ugai, K.Kondoh: "Computer studies on the spontaneous fast reconnection evolution in various phsycal situations"Phys. Plasmas. Vol.8, No.5. 1545-1552 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ugai: "Physical mechanism of spontaneous fast reconnection evolution"Earth Planets Space. Vol.53, No.6. 217-224 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ugai: "Basic physical mechanism of fast reconnection evolution in space plasmas"Space Science Reviews. Vol.95. 601-611 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ugai: "Computer simulations of asymmetric spontaneous fast reconnection"Phys. Plasmas. Vol.7, No.3. 867-874 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ugai: "Computer studies on the spontaneous fast reconnection model as a nonlinear instability"Phys. Plasmas. Vol.6, No.5. 1522-1531 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ugai: "Basic physical mechanism of reconnection development and magnetic loop dynamics"J. Geophys. Res. Vol.104, No.4. 6929-6939 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Shimizu and M.Ugai: "Magnetohydrodynamic study of adiabatic supersonic and subsonic expansion accelerations in spontaneous fast magnetic reconnection"Phys.Plasmas. (in press). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ugai, K.Kondoh and T.Shimizu: "Computer simulations on three-dimensional magnetic loop dynamics by the spontaneous fast reconnection"Phys.Plasmas. (in press). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ugai and T.Shimizu: "Computer studies on the spontaneous fast reconnection evolution in a force-free current sheet system"Phys.Plasmas. Vol.9, No.3. 816-823 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ugai and K.Kondoh: "Computer studies on the spontaneous fast reconnection evolution in various physical situations"Phys.Plasmas. Vol.8, No.5. 1545-1552 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ugai: "Physical mechanism of spontaneous fast reconnection evolution"Earth Planets Space. Vol.53, No.6. 217-224 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ugai: "Basic physical mechanism of fast reconnection evolution in space plasmas"Space Science Reviews. Vol.95. 601-611 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ugai: "Computer simulations of asymmetric spontaneous fast reconnection"Phys.Plasmas. Vol.7, No.3. 867-874 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ugai: "Computer studies on the spontaneous fast reconnection model as a nonlinear instability"Phys.Plasmas. Vol.6, No.5. 1522-1531 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ugai: "Basic physical mechanism of reconnection development and magnetic loop dynamics"J.Geophys.Res.. Vo.104, No.4. 6929-6939 (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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