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Paper: Three-Dimensional Structure Analysis of Coronal Magnetic Field in AR NOAA 10930 Based on Vector Magnetogram Observations with Hinode/SOT
Volume: 397, First Results From Hinode
Page: 110
Authors: Inoue, S.; Kusano, K.; Masuda, S.; Miyoshi, T.; Yamamoto, T.; Magara, T.; Tsuneta, S.; Sakurai, T.; Yokoyama, T.; the US/Japan SOT team
Abstract: Active region NOAA 10930 produced the first X-class flare observed by the Hinode satellite. Fortunately, the data covers the time span before and after the X-class flare arising on December 13, 2006 in this active region. During this event, the Hinode satellite clearly observed the typical features of a flare: two ribbon and post flare loop structures seen by SOT, sigmoidal structure before the onset, and subsequent cusp loop structure seen by XRT. We analyzed the three-dimensional magnetic structure of the region before and after the flare on Dec.13, 2006 using the Non-Linear Force-Free (NLFF) extrapolation method based on extended magnetofrictional method.

As a result of the NLFF extrapolation, we found that, before the flare onset, strong sheared structures were formed on the neutral line. Furthermore, we revealed that a sigmoidal structure was not formed of a single loop, but was composed of strong multiple sheared field. On other the hand, after the flare, elongated magnetic flux is partially formed and a part of magnetic shear was released. The result indicates that the part of NLFF relaxes toward the potential like field in this event.

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