Observational Evidence of Magnetic Reconnection for Brightenings and Transition Region Arcades in IRIS Observations
Observational Evidence of Magnetic Reconnection for Brightenings and Transition Region Arcades in IRIS Observations
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DOI：
10.3847/1538-4357/836/1/52
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
Jie Zhao;B. Schmieder;Hui Li;E. Pariat;Xiaoshuai Zhu;Li Feng;M. Grubecka
中科院分区：
文献类型：
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作者：
Jie Zhao;B. Schmieder;Hui Li;E. Pariat;Xiaoshuai Zhu;Li Feng;M. Grubecka
本文利用一种新的强迫场外推方法，对界面区成像光谱仪和太阳动力学天文台观测到的AR 11850出射通量区进行了研究。我们的研究结果表明，在这个新兴的区域亮点（BP）表现出响应线形成的上层光球过渡区，具有相对相似的形态。根据大气成像组件在1600和1700华氏度的数据，它们有几分钟的振荡。在1600和1700 μ m过滤图中测量的BP强度之间的比率揭示了这些BP被不同地加热。我们对日震和磁成像仪矢量磁场和AR11850中相应拓扑结构的分析表明，BPs位于极性反转线上，其中大多数与磁场重联或抵消有关。由于不同的磁拓扑结构，BP的加热可能不同。我们发现，由于磁抵消的加热将比秃斑重联的情况下更强。在此过程中，等离子体密度而不是磁场强度可能起主导作用。基于低层大气的物理条件，我们的强迫场外推显示了在缝颚图像1400 ° C中可见的明亮弧线与通过秃斑的外推场线之间的一致结果。这为验证模拟研究中提出的新兴通量区BPs和弧的磁场重联机制提供了可靠的观测证据。
By using a new method of forced-field extrapolation, we study the emerging flux region AR11850 observed by the Interface Region Imaging Spectrograph and Solar Dynamical Observatory. Our results suggest that the bright points (BPs) in this emerging region exhibit responses in lines formed from the upper photosphere to the transition region, which have relatively similar morphologies. They have an oscillation of several minutes according to the Atmospheric Imaging Assembly data at 1600 and 1700 Å. The ratio between the BP intensities measured in 1600 and 1700 Å filtergrams reveals that these BPs are heated differently. Our analysis of the Helioseismic and Magnetic Imager vector magnetic field and the corresponding topology in AR11850 indicates that the BPs are located at the polarity inversion line and most of them are related to magnetic reconnection or cancelation. The heating of the BPs might be different due to different magnetic topology. We find that the heating due to the magnetic cancelation would be stronger than the case of bald patch reconnection. The plasma density rather than the magnetic field strength could play a dominant role in this process. Based on physical conditions in the lower atmosphere, our forced-field extrapolation shows consistent results between the bright arcades visible in slit-jaw image 1400 Å and the extrapolated field lines that pass through the bald patches. It provides reliable observational evidence for testing the mechanism of magnetic reconnection for the BPs and arcades in the emerging flux region, as proposed in simulation studies.