STRUCTURE AND STABILITY OF MAGNETIC FIELDS IN SOLAR ACTIVE REGION 12192 BASED ON NONLINEAR FORCE-FREE FIELD MODELING
作者： S. Inoue , K. Hayashi , K. Kusano
DOI: 10.3847/0004-637X/818/2/168
关键词: Flux tube 、 Excitation 、 Coronal mass ejection 、 Instability 、 Computational physics 、 Physics 、 Flare 、 Magnetic field 、 Magnetic structure 、 Solar flare
摘要: We analyze a three-dimensional (3D) magnetic structure and its stability in large solar active region (AR) 12192, using the 3D coronal field constructed under nonlinear force-free (NLFFF) approximation. In particular, we focus on that produced an X3.1-class flare, which is one of X-class flares observed AR 12192. According to our analysis, contains multiple-flux-tube system, e.g., flux tube, with footpoints are anchored bipole field, other tubes exist close polarity inversion line (PIL). These various different sizes shapes coexist there. latter embedded along PIL, produces favorable shape for tether-cutting reconnection related flare. further found most twists not released even after consistent fact no observational evidence major eruptions was found. On hand, upper part tube beyond critical decay index, essential excitation torus instability before though mass ejections were observed. discuss complicated system suggest reason existence stable tube. addition, point out possibility tracing flare ribbons, basis detailed structural analysis NLFFF
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