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arXiv 1605.04047astro-ph.SRphysics.space-ph
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大爆发期间太阳磁通量绳足点的特征

On the Characteristics of Footpoints of Solar Magnetic Flux Ropes during the Eruption

X. Cheng, M. D. Ding

备注：
2 tables, 23 pages, 23 figures, Accepted for publication in ApJ Supplement Series
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摘要：

我们研究了四个爆发的磁通量绳（MFR）的足迹，这些绳在爆发之前在大气成像组件高温通带中表现为S形热通道。日震和磁成像仪的同步观测揭示，磁共振的一个足点起源于具有较强磁场的半影或半影边缘，而另一个足点则起源于具有较弱磁场的苔藓区。MFRs的轴与主极性反转线和相关灯丝的显著偏离表明MFRs已经上升到高海拔，因此可以与源S形AR区分开。更有趣的是，随着MFR的爆发，具有较强磁场的足点处的平均倾角和直流电流趋于减小，这暗示了MFR腿中的磁场的拉直和解扭。此外，相关的耀斑带也显示了一个有趣的演变。它们最初出现在MFRs的两个足点和下方区域的零星增亮，然后迅速延伸到两个细长的剪切J形条带，其两个钩对应于MFRs的两端。最后，两条丝带的直线部分相互分离，演变成两条加宽的平行丝带。这些特征大多符合并支持最近提出的三维标准CME/耀斑模型，即，扭曲的MFR喷发拉伸并导致上覆场的重联，随着高度的增加，上覆场由强剪切向弱剪切过渡。

英文摘要：

We investigate the footpoints of four erupted magnetic flux ropes (MFRs) that appear as sigmoidal hot channels prior to the eruptions in the Atmospheric Imaging Assembly high temperaure passbands. The simultaneous Helioseismic and Magnetic Imager observations disclose that one footpoint of the MFRs originates in the penumbra or penumbra edge with a stronger magnetic field, while the other in the moss region with a weaker magnetic field. The significant deviation of the axis of the MFRs from the main polarity inversion lines and associated filaments suggests that the MFRs have ascended to a high altitude, thus being distinguishable from the source sigmoidal ARs. The more interesting thing is that, with the eruption of the MFRs, the average inclination angle and direct current at the footpoints with stronger magnetic field tend to decrease, which is suggestive of a straightening and untwisting of the magnetic field in the MFR legs. Moreover, the associated flare ribbons also display an interesting evolution. They initially appear as sporadical brightenings at the two footpoints of and in the regions below the MFRs and then quickly extend to two slender sheared J-shaped ribbons with the two hooks corresponding to the two ends of the MFRs. Finally, the straight parts of the two ribbons separate from each other, evolving into two widened parallel ones. These features mostly conforms to and supports the recently proposed three-dimensional standard CME/flare model, i.e., the twisted MFR eruption stretches and leads to the reconnection of the overlying field that transits from a strong to weak shear with the increasing height.

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