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arXiv 0709.2397astro-ph
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2006年12月13日与耀斑相关的矢量磁场变化的日出观测

Hinode Observations of Vector Magnetic Field Change Associated with a Flare on 2006 December 13

Masahito Kubo, Takaaki Yokoyama, Yukio Katsukawa, Bruce W Lites, Saku Tsuneta, Yoshinori Suematsu, Kiyoshi Ichimoto, Toshifumi Shimizu, Shin'ichi Nagata, Theodo… 展开作者

Masahito Kubo, Takaaki Yokoyama, Yukio Katsukawa, Bruce W Lites, Saku Tsuneta, Yoshinori Suematsu, Kiyoshi Ichimoto, Toshifumi Shimizu, Shin'ichi Nagata, Theodore D Tarbell, Richard A Shine, Alan M Title, David Elmore

摘要:

2007年12月6日至19日期间,利用日出号航天器上的太阳光学望远镜成功地对耀斑活动区10930进行了连续观测。我们专注于光球磁场在这个活动区的演变,和磁场属性在网站的X3.4级耀斑,使用时间序列的矢量场地图具有高空间分辨率。X3.4级耀斑发生在2006年12月13日,在巨大的相反极性的本影之间的明显碰撞地点。在耀斑爆发前一天,在碰撞地点的半影区出现了由磁通量出现引起的正负极性交替的细长磁结构。随后,在碰撞现场的极性反转线变得非常复杂。在这些细长的磁性结构的形成过程中,在Ca II H的明亮的环路的数量增加。耀斑带和亮环沿极性反转线演化,亮环的一个足点位于磁场方位角偏离较大的区域。高空间分辨率和高偏振精度的SOT观测揭示了耀斑区磁场精细结构的时间变化:复杂的极性反转线部分消失,光球磁场方位角变化约90 °,在碰撞区内空间分布更加均匀。

英文摘要:

Continuous observations of a flare productive active region 10930 were successfully carried out with the Solar Optical Telescope onboard the Hinode spacecraft during 2007 December 6 to 19. We focus on the evolution of photospheric magnetic fields in this active region, and magnetic field properties at the site of the X3.4 class flare, using a time series of vector field maps with high spatial resolution. The X3.4 class flare occurred on 2006 December 13 at the apparent collision site between the large, opposite polarity umbrae. Elongated magnetic structures with alternatingly positive and negative polarities resulting from flux emergence appeared one day before the flare in the collision site penumbra. Subsequently, the polarity inversion line at the collision site became very complicated. The number of bright loops in Ca II H increased during the formation of these elongated magnetic structures. The flare ribbons and bright loops evolved along the polarity inversion line and one footpoint of the bright loop was located in a region having a large departure of field azimuth angle with respect to its surroundings. The SOT observations with high spatial resolution and high polarization precision reveal temporal change in fine structure of magnetic fields at the flare site: some parts of the complicated polarity inversion line then disappeared, and in those regions the azimuth angle of photospheric magnetic field changed by about 90 degrees, becoming more spatially uniform within the collision site.

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