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2007 Fiscal Year Final Research Report Summary

Three dimensional computer simulations on the spontaneous fast reconnection model

Research Project

Project/Area Number 16540450
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

UGAI Masayuki  Ehime University, Research center for space and cosmic evolution, Professor (10036444)

Co-Investigator(Kenkyū-buntansha) SHIMIZU Tohru  Ehime University, Research center for space and cosmic evolution, Associate Professor (60196524)
KONDOH Koji  Ehime University, Research center for space and cosmic evolution, Assistant Professor (30304653)
Project Period (FY) 2004 – 2007
Keywordsmagnetic reconnection / magnetohvdrodvnamics / substorms / solar flares / lasmaoid / TCR / coronal heating / shocks
Research Abstract

We have proposed the spontaneous fast reconnection model, and its basic physical mechanism has been studied by precise three-dimensional 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. The spontaneous fast reconnection model is applied to the so-called Traveling Compression Regions (TCR) observed in the distant tail lobe in association with substorm onset, and the basic features are exactly explained both qualitatively and quantitatively. We also apply the model to the substrom current wedge, known as a long-standing question, and demonstrate the drastic evolution of the magnetospheric current wedge for the first time. In addition, the current wedge evolution is applied to two-ribbon flares, and it is demonstrated that major features of solar flares can pertinently explained.

  • Research Products

    (21 results)

All 2008 2007 2006 2005 2004

All Journal Article (19 results) Presentation (2 results)

  • [Journal Article] Impulsive chromospheric heating of two-ribbon flares by the fast reconnection mechanism2008

    • Author(s)
      M. Ugai
    • Journal Title

      Phys. Plasmas 15

      Pages: 032902

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Numerical studies on three dimensional earthward fast plasma flows in the near-Earth plasma sheet by the spontaneous fast reconnection model2008

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

      J. Geophys. Res. 113

      Pages: A03S07

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Numerical studies on three dimensional earthward fast plasma flows in the near Earth plasma sheet by the spontaneous fast reconnection Model2008

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

      J. Geophys. Res 113

      Pages: A03S07

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Modeling of two-ribbon flares by the fast reconnectionmechanism2007

    • Author(s)
      M. Ugai
    • Journal Title

      Phys. Plasmas 14

      Pages: 102904

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Conditions for drastic evolution o fmagnetospheric currentwedge2007

    • Author(s)
      M. Ugai
    • Journal Title

      Phys. Plasmas 14

      Pages: 062902

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Modeling of two-ribbon flares by the fast reconnection mechanism2007

    • Author(s)
      M. Ugai
    • Journal Title

      Phys. Plasmas 14

      Pages: 102904

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Conditions for drastic evolution of magnetospheric current wedge2007

    • Author(s)
      M. Ugai
    • Journal Title

      Phys. Plasmas 14

      Pages: 062902

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Evolution of magnetospheric current wedge by the spontaneous fast reconnection model2006

    • Author(s)
      M. Ugai and K. Kondoh
    • Journal Title

      Phys. Plasmas 13

      Pages: 102903

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Parametric studies on traveling compression regions observed in the Earth's magnetotail2006

    • Author(s)
      M. Ugai and L. Zheng
    • Journal Title

      Phys. Plasmas 13

      Pages: 062906

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Modeling of traveling compression regions in the Earth's magnetotail by the spontaneous fast reconnection model2006

    • Author(s)
      M. Ugai and L. Zheng
    • Journal Title

      Phys. Plasmas 13

      Pages: 032901

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Evolution of magnetospheric current wedge by the spontaneous fast reconnection model2006

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

      Phys. Plasmas 13

      Pages: 102903

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Parametric studies on traveling compression regions observed in the Earth's magnetotail2006

    • Author(s)
      M. Ugai, L. Zheng
    • Journal Title

      Phys. Plasmas 13

      Pages: 062906

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Modeling of traveling compression regions in the Earth's magnetotail by the spontaneous fast reconnection model2006

    • Author(s)
      M. Ugai, L. Zheng
    • Journal Title

      Phys. Plasmas 13

      Pages: 032901

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Conditions for the fast reconnection mechanism in three dimensions2005

    • Author(s)
      M. Ugai and L. Zheng
    • Journal Title

      Phys. Plasmas

      Pages: 092-312

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

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

      Phys. Plasmas 12

      Pages: 042903

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Conditions for the fast reconnection mechanism in three dimensions2005

    • Author(s)
      M. Ugai, L. Zheng
    • Journal Title

      Phys. Plasmas 12

      Pages: 092312

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Spontaneous fast reconnection model in three dimensions2005

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

      Phys. Plasmas 12

      Pages: 042903

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

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

      Phys. Plasmas 11

      Pages: 1416-1423

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

      Phys. Plasmas 11

      Pages: 1416-1423

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Conditions for current wedge evolution and applications to two-ribbon flares2008

    • Author(s)
      M. Ugai
    • Organizer
      Earth-Sun System Exploration
    • Place of Presentation
      Hawaii
    • Year and Date
      2008-01-14
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Modeling of substorms and flares by the fast reconnection mechanism2007

    • Author(s)
      M. Ugai,
    • Organizer
      Comparative Study of Solar Flares and Magnetospheric Substorms as a Basis of Space Weather Research
    • Place of Presentation
      Fairbanks, Alaska
    • Year and Date
      2007-03-18
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2010-02-04  

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