THE RAPID FORMATION OF A FILAMENT CAUSED BY MAGNETIC RECONNECTION BETWEEN TWO SETS OF DARK THREADLIKE STRUCTURES
THE RAPID FORMATION OF A FILAMENT CAUSED BY MAGNETIC RECONNECTION BETWEEN TWO SETS OF DARK THREADLIKE STRUCTURES
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DOI：
10.3847/0004-637x/816/1/41
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发表时间：
2015-12
期刊：
影响因子：
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通讯作者：
Bo Yang;Yunchun Jiang;Jiayan Yang;Shu-Hong Yu;Zhe Xu
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文献类型：
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作者：
Bo Yang;Yunchun Jiang;Jiayan Yang;Shu-Hong Yu;Zhe Xu
利用来自大气成像组件(AIA)和太阳动力学天文台上的日震和磁成像仪的高时空分辨率观测，我们提供了两组暗线状结构之间的磁重联导致的快速形成灯丝的罕见观测结果。这两组暗线状结构属于不同的磁通系统，它们的相邻两端锚定在一个相反的磁场区，计算的光球速度场表明，在那里汇聚的流占主导地位。由于汇聚的流动，相反极性的磁通量会聚，然后被抵消，导致极紫外线(EUV)亮化的形成，该亮化沿着暗线状结构的脊椎以相反的方向扩散。与此同时，在暗线状结构的其他末端出现了很弱的远程亮度，以及植根于相反磁场区的EUV环。此外，所有的AIA铁线观测都表明，在极紫外变亮的消退过程中，形成了磁绳并经历了滚动运动。不久之后，随着极光增亮的消失，形成了一个很可能由两组相互交织的暗线状结构组成的丝状结构。通过差示发射测量(EM)分析发现，在光亮过程中，通量抵消位置附近的等离子体的EM和温度都有所增加，这意味着在那里可能发生了磁重联来加热等离子体。这些观测结果提供了证据，证明该暗条是由与磁通会聚和抵消有关的磁重联形成的，并且该暗条的磁结构很可能是磁绳。
Taking advantage of the high spatiotemporal resolution observations from the Atmospheric Imaging Assembly (AIA) and the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory, we present rare observations of the rapid formation of a filament caused by magnetic reconnection between two sets of dark threadlike structures. The two sets of dark threadlike structures belong to distinct flux systems with their adjacent ends anchored in an opposite-polarity magnetic field region, where the calculated photospheric velocity field shows that converging flows dominate there. Due to the converging flows, opposite-polarity magnetic flux converged and then canceled, leading to the formation of extreme ultraviolet (EUV) brightening that spread in opposite directions along the spine of the dark threadlike structures. Meanwhile, very weak remote brightening in the other terminals of the dark threadlike structures, as well as EUV loops, which rooted in the opposite-polarity magnetic field region, appeared. In addition, all of the AIA Fe line observations reveal that a flux rope was formed and underwent a rolling motion during the fadeaway of the EUV brightening. Soon after, as the EUV brightening disappeared, a filament that is very likely composed of two sets of intertwined dark threadlike structures was formed. Via differential emission measure (EM) analysis, it is found that both the EM and temperature of the plasma around the flux-canceling site increased during the brightening, implying that there, magnetic reconnection may occur to heat the plasma. These observations provide evidence that the filament is formed by magnetic reconnection associated with flux convergence and cancellation, and the magnetic structure of the filament is most likely a flux rope.