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arXiv 1902.00348astro-ph.SR
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光桥的精细磁特性

Fine Magnetic Characteristics of a Light Bridge by Hinode

S. Liu, D. Liu

摘要:

光桥(LB)是穿过太阳黑子本影的明亮结构,与太阳黑子的分裂或聚集有关。本文利用{ \it Hinode}卫星的观测资料,提出并研究了一种LB。根据太阳光学望远镜(SOT)的分光偏振仪(SP)观测到的矢量磁图,计算了无力因子($α$)、电流的z分量($J_{z}$)和张力的z分量($T_{z}$)。发现LB的$α$和$J_{z}$的振幅普遍大于本影的振幅。发现沿LB有两个$J_{z}$符号,在LB的中间位置附近被分开。结果表明,LB的$T_{z}$的幅值小于本影的幅值,并且在LB和本影的边界之间存在$T_{z}$的符号变化。通过比较研究,认为LB和本影可能是两个不同的磁系,这是相互作用磁重联产生的必要条件。

英文摘要:

Light bridge (LB) is bright structure crossing the umbra of sunspots and associated to the breakup or assembly of sunspots. In this paper, a LB is presented and studied using the observatory data obtained by {\it Hinode} satellites. Force-free factor ($α$) and the z-component of current ($J_{z}$) and tension force ($T_{z}$) are calculated basing on the vector magnetograms observed by Spectro-Polarimeter (SP) of the Solar Optical Telescope (SOT) on board {\it Hinode}. It is found that the amplitudes of $α$ and $J_{z}$ of LB are generally larger than those of umbra. It is found that there are two signs of $J_{z}$ along LB, which are divided at near the middle position of LB. It is found that the amplitudes of $T_{z}$ of LB are smaller than those of umbra and there are changes of sign of $T_{z}$ between the boundary of LB and umbra. Through comparisons and investigations, it suggest that LB and umbra maybe two different magnetic systems, which is a necessary condition for interaction magnetic reconnection.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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