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Simulation study of the Solar flare onset mechanism and the self-organization in the Solar coronal plasma

Published online by Cambridge University Press:  20 December 2006

K. KUSANO ,
N. NISHIKAWA ,
S. INOUE ,
T. MAESHIRO  and
T. SAKURAI
K. KUSANO
Affiliation:
The Earth Simulator Center, Japan Agency for Marine–Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan
N. NISHIKAWA
Affiliation:
The Earth Simulator Center, Japan Agency for Marine–Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan
S. INOUE
Affiliation:
Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
T. MAESHIRO
Affiliation:
Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan Present address: Information and Mathematical Science Laboratory, Inc., 1-5-21 Ohtsuka, Bunkyo-ku, Tokyo 112-0012, Japan.
T. SAKURAI
Affiliation:
National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
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Abstract

Three-dimensional magnetohydrodynamics of the Solar coronal plasma is investigated by numerical simulation, aiming to understand the mechanisms of the Solar flare onset. It is demonstrated by the simulations that the resistive tearing mode instability growing on the magnetic shear inversion layer can drive the large-scale eruption through the mutual excitation of double reconnections. It is also revealed that the instability is able to cause the magnetohydrodynamic energy relaxation, in which the typical sigmoidal structure is self-organized prior to the onset of eruption. The simulation results predict that both the formation of sigmoids and the onset of flares should occur around the electric current sheet where the magnetic shear is steeply reversed. It is consistent with the reversed-shear flare model and the vector magnetograph observations.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 979 - 982
Copyright
2006 Cambridge University Press

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