Magnetic Relaxation Seen in a Rapidly Evolving Light Bridge in a Sunspot
Magnetic Relaxation Seen in a Rapidly Evolving Light Bridge in a Sunspot
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DOI：
10.3847/1538-4357/ad1ab0
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发表时间：
2024-02
期刊：
影响因子：
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通讯作者：
D. Song;E. Lim;J. Chae;Y. Kim;Yukio Katsukawa;V. Yurchyshyn
中科院分区：
文献类型：
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作者：
D. Song;E. Lim;J. Chae;Y. Kim;Yukio Katsukawa;V. Yurchyshyn
我们报告了一个与瞬态光桥（LB）演化相关的黑子内部磁弛豫过程。从高分辨率成像和光谱偏振数据所采取的1.6米古德太阳望远镜安装在大熊太阳天文台，我们观察到一个快速发展的LB的演变过程。LB的形成是由于具有相对水平场的平行构造强烈侵入垂直本影场区的结果。在黑子磁场拓扑变化迅速的局部区域，特别是在LB和本影的边界区域，沿着探测到强电流密度，通过磁场重联在色球层沿着这一区域间歇性地重复观测到明亮的喷流.在我们观测的后半部分，LB内磁场的水平分量减小，并且恢复了太阳黑子内的典型对流结构，其表现为本影点。我们的研究结果提供了一个全面的视角，不仅对LB本身的演变，而且对它在邻近地区的影响，包括色球活动和太阳黑子的磁能变化。
We report a magnetic relaxation process inside a sunspot associated with the evolution of a transient light bridge (LB). From high-resolution imaging and spectro-polarimetric data taken by the 1.6 m Goode Solar Telescope installed at Big Bear Solar Observatory, we observe the evolutionary process of a rapidly evolving LB. The LB is formed as a result of the strong intrusion of filamentary structures with relatively horizontal fields into the vertical umbral field region. A strong current density is detected along a localized region where the magnetic field topology changes rapidly in the sunspot, especially in the boundary region between the LB and the umbra, and bright jets are observed intermittently and repeatedly in the chromosphere along this region through magnetic reconnection. In the second half of our observation, the horizontal component of the magnetic field diminishes within the LB, and the typical convection structure within the sunspot, which manifests itself as umbral dots, is restored. Our findings provide a comprehensive perspective not only on the evolution of an LB itself but also on its impacts in the neighboring regions, including the chromospheric activity and the change of magnetic energy of a sunspot.