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arXiv 2201.11314astro-ph.SR
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外部磁重联引起的三步部分暗条爆发

A partial filament eruption in three steps induced by external magnetic reconnection

Jun Dai, Zhentong Li, Ya Wang, Zhe Xu, Yanjie Zhang, Leping Li, Qingmin Zhang, Yingna Su, Haisheng Ji

摘要:

我们对2012年6月17日活动区NOAA 11504的部分暗条喷发进行了调查。我们首次利用10830的高分辨率窄带图像观测到了部分喷发过程中的垂直分裂过程。活动暗条扎根于活动区的一个小黑子中。特别是,它经历了三个步骤,即前兆,第一次爆发,第二次爆发,而后两个分别与C1.0耀斑和C3.9耀斑。在前兆期间,缓慢的磁重联发生在暗条和相邻的环之间,这些环也植根于太阳黑子。连续的重连不仅导致丝状体垂直分裂成三组丝状体,而且还形成了一条新的丝状体,这条丝状体正在生长,并伴随着场地周围的增亮。随后,生长的丝状体与一组分裂的丝状体一起喷发,导致第一次喷发。在第一次喷发开始时,随后的磁重联发生在喷发的分裂线和另一个周围的磁环之间。大约三分钟后,由于磁重联引起的两个较大的不稳定细丝的喷发,第二次喷发发生了。高分辨率观测提供了暗条与周围磁场之间的磁重联能引起暗条垂直分裂从而导致部分喷发的直接证据。

英文摘要:

We present an investigation of partial filament eruption on 2012 June 17 in the active region NOAA 11504. For the first time, we observed the vertical splitting process during the partial eruption with high resolution narrow band images at 10830 . The active filament was rooted in a small sunspot of the active region. Particularly, it underwent the partial eruption in three steps, i.e. the precursor, the first eruption, and the second eruption, while the later two were associated with a C1.0 flare and a C3.9 flare, respectively. During the precursor, slow magnetic reconnection took place between the filament and the adjoining loops that also rooted in the sunspot. The continuous reconnection not only caused the filament to split into three groups of threads vertically but also formed a new filament, which was growing and accompanied brightening took place around the site. Subsequently, the growing filament erupted together with one group splitted threads, resulted in the first eruption. At the beginning of the first eruption, a subsequent magnetic reconnection occurred between the erupting splitted threads and another ambient magnetic loop. After about three minutes, the second eruption occurred as a result of the eruption of two larger unstable filaments induced by the magnetic reconnection. The high-resolution observation provides a direct evidence that magnetic reconnection between filament and its ambient magnetic fields could induce the vertical splitting of the filament, resulting in partial eruption.

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