2002 Fiscal Year Final Research Report Summary
Magnetohydrodynamic and electromagnetic-particle simulations on the spontaneous fast magnetic reconnection model
| Project/Area Number |
11440146
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | Ehime University |
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Principal Investigator |
UGAI Masayuki Ehime University, Faculty of Engineering, Professor, 工学部, 教授 (10036444)
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| 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)
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| Project Period (FY) |
1999 – 2002
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| Keywords | magnetic reconnection / magnetohydrodynamics / fluid and particle computer simulations / substorms / flares / space plasmas / anomalous resistivity / slow and fast shocks |
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| 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.
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