arXiv 2009.040822020-09-11astro-ph.SR

由磁通量的出现、会聚和抵消驱动的活动区中心微小磁通绳的形成

Formation of a tiny flux rope in the center of an active region driven by magnetic flux emergence, convergence, and cancellation

Ruisheng Zheng, Yao Chen, Bing Wang, Hongqiang Song, Wenda Cao

发表信息：: A&A 642, A199 (2020)
DOI：: 10.1051/0004-6361/202037475

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摘要：

通量绳被认为是太阳爆发的核心结构，对空间天气具有重要意义，但其形成机制仍存在很大争议。我们报告了2018年8月24日在活动区域环团下方形成的微小通量绳。结合多台仪器的高质量多波长观测，我们详细研究了光球层、色球层和日冕中的事件。在源区，连续出现两个正极性（P1和P2），表现为两个孔隙（A和B）是明确的。有趣的是，P2和孔B慢慢接近P1和孔A，这意味着磁通量会聚。在出现和会聚期间，P1和P2相继与出现的较小负极性（N3）相互作用，这导致连续的磁通量抵消。结果，叠加的环被剪切得更厉害，最后演变成一个微小的扭曲通量绳，这可以通过一个短暂的反S形S形、具有蓝移和红移特征的扭曲细丝和一个热通道来证明。结果表明，活动区中心微小磁绳的形成与光球层中连续的磁通量产生、汇聚和抵消密切相关。因此，我们认为，磁通量的出现，收敛和取消的微小磁绳的形成是至关重要的。

英文摘要：

Flux ropes are generally believed to be core structures of solar eruptions that are significant for the space weather, but their formation mechanism remains intensely debated. We report on the formation of a tiny flux rope beneath clusters of active region loops on 2018 August 24. Combining the high-quality multiwavelength observations from multiple instruments, we studied the event in detail in the photosphere, chromosphere, and corona. In the source region, the continual emergence of two positive polarities (P1 and P2) that appeared as two pores (A and B)is unambiguous. Interestingly, P2 and Pore B slowly approached P1 and Pore A, implying a magnetic flux convergence. During the emergence and convergence, P1 and P2 successively interacted with a minor negative polarity (N3) that emerged, which led to a continuous magnetic flux cancellation. As a result, the overlying loops became much sheared and finally evolved into a tiny twisted flux rope that was evidenced by a transient inverse S-shaped sigmoid, the twisted filament threads with blueshift and redshift signatures, and a hot channel. All the results show that the formation of the tiny flux rope in the center of the active region was closely associated with the continuous magnetic flux emergence, convergence, and cancellation in the photosphere. Hence, we suggest that the magnetic flux emergence, convergence, and cancellation are crucial for the formation of the tiny flux rope.

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