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Onset Mechanism of M6.5 Solar Flare Observed in Active Region 12371  

Jihye Kang   Submitted: 2019-11-13 22:05

We studied a flare onset process in terms of stability of a three-dimensional (3D) magnetic field in active region 12371 producing an eruptive M6.5 flare in 2015 June 22. In order to reveal the 3D magnetic structure, we first extrapolated the 3D coronal magnetic fields based on time series of the photospheric vector magnetic fields under a nonlinear force-free field (NLFFF) approximation. The NLFFFs nicely reproduced the observed sigmoidal structure which is widely considered as pre-eruptive magnetic configuration. We, in particular, found that the sigmoid is composed of two branches of sheared arcade loops. On the basis of the NLFFFs, we investigated the sheared arcade loops to explore the onset process of the eruptive flare using three representative MHD instabilities: the kink, torus and double arc instabilities. The double arc instability, recently proposed by Ishiguro & Kusano, is a double arc loop can be more easily destabilized than a torus loop. Consequently, the NLFFFs are found to be quite stable against the kink and torus instabilities. However, the sheared arcade loops formed prior to the flare possibly becomes unstable against the double arc instability. As a possible scenario on the onset process of the M6.5 flare, we suggest three-step process: (1) double arc loop are formed by the sheared arcade loops through the tether-cutting reconnection during an early phase of the flare, (2) the double arc instability contributes to the expansion of destabilized double arc loops and (3) finally, the torus instability makes the full eruption.

Authors: Jihye Kang, Satoshi Inoue, Kanya Kusano, Sung-Hong Park and Yong-Jae Moon
Projects: None

Publication Status: ApJ (accepted)
Last Modified: 2019-11-18 20:04
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Onset Mechanism of M6.5 Solar Flare Observed in Active Region 12371

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