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Paper: Simulation Study of Transition Process from Long-Lived Sigmoid to Flare Eruption
Volume: 369, New Solar Physics with Solar-B Mission
Page: 469
Authors: Kusano, K.
Abstract: The formation mechanism of sigmoidal structure in the solar corona and the transition process from long-lived sigmoid to flare eruption are studied on the basis of the Taylorís minimum energy principle and the three-dimensional magnetohydrodynamic numerical simulations. The simulation results indicate that magnetic reconnection driven by the resistive tearing mode instability growing on current sheet, where magnetic shear is steeply reversed, may cause the formation of sigmoidal structure. The mechanism of that can be explained as the spontaneous manifestation of the Taylorís minimum energy state in magnetic arcade geometry. Furthermore, it is also numerically demonstrated that the formation of sigmoid can be followed by the eruption of magnetic flux. In the eruption, however, the sigmoidal flux itself is not ejected upward, but it is collapsed by the reconnection with overlaying magnetic field. The results are consistent with the reversed shear flare model recently proposed by Kusano et al., which predicts that the coronal eruption is triggered by the collapsing of magnetic arcade due to the annihilation of positive and negative magnetic helicity.
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