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arXiv 1807.00992astro-ph.SR
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由一系列射流驱动的有源区灯丝的形成

Formation of an active region filament driven by a series of jets

Jincheng Wang, Xiaoli Yan, ZhongQuan Qu, Satoru UeNo, Kiyoshi Ichimoto, Linhua Deng, Wenda Cao, Zhong Liu

摘要:

我们介绍了2016年8月11日至12日期间活动区NOAA 12574中的暗条形成过程。结合GONG H $α$、HIDA谱和SDO/AIA 304 A的观测,研究了暗条的形成过程.发现冷物质($T\sim10^4$ K)是由一系列的喷流从西足点的细丝。与此同时,磁通量也从光球层的暗条西足点附近出现。这些观测结果表明,低层大气中的冷物质可以直接注入高层大气,喷流是由先前存在的磁场和新出现的磁场之间的磁重联触发的。利用GST/BBSO TiO观测系统对8月11日18:02 UT的一次喷流进行了详细的研究,发现喷流后的西足点附近出现了一些暗丝,等离子体沿暗丝轴的投影速度约为162.6 $\pm$ 5.4 km/s。利用DST/Hida观测资料,我们发现8月12日00:42 UT的一个喷流注入的等离子体是旋转的。因此,我们认为射流不仅为暗条提供了物质,同时也将螺旋度注入了暗条。比较质量注入量的射流与质量的灯丝,我们得出结论,估计的质量负载的射流是足以占质量的灯丝。

英文摘要:

We present a formation process of a filament in active region NOAA 12574 during the period from 2016 August 11 to 12. Combining the observations of GONG H$α$, Hida spectrum and SDO/AIA 304 A, the formation process of the filament is studied. It is found that cool material ($T\sim10^4$ K) is ejected by a series of jets originating from the western foot-point of the filament. Simultaneously, the magnetic flux emerged from the photosphere in the vicinity of the western foot-point of the filament. These observations suggest that cool material in the low atmosphere can be directly injected into the upper atmosphere and the jets are triggered by the magnetic reconnection between pre-existing magnetic fields and new emerging magnetic fields. Detailed study of a jet at 18:02 UT on August 11 with GST/BBSO TiO observations reveals that some dark threads appeared in the vicinity of the western foot-point after the jet and the projection velocity of plasma along the filament axis was about 162.6$\pm$5.4 km/s. Using with DST/Hida observations, we find that the injected plasma by a jet at 00:42 UT on August 12 was rotating. Therefore, we conclude that the jets not only supplied the material for the filament, but also injected the helicity into the filament simultaneously. Comparing the quantity of mass injection by the jets with the mass of the filament, we conclude that the estimated mass loading by the jets is sufficient to account for the mass in the filament.

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