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题名: Observational Evidence of Magnetic Reconnection for Brightenings and Transition Region Arcades in IRIS Observations
作者: Zhao, Jie; Schmieder, Brigitte; Li, Hui; Pariat, Etienne; Zhu, Xiaoshuai; Feng, Li; Grubecka, Michalina
作者部门: 空间科学部
通讯作者: Li, H (reprint author), Key Lab Dark Matter & Space Astron, Purple Mountains Observat, CAS, Nanjing 210008, Peoples R China.
关键词: Sun: chromosphere ; Sun: magnetic fields ; Sun: transition region
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2017
卷号: 836, 期号:1, 页码:52
收录类别: SCI
项目资助者: NSFC [11273065, 11503089, 11522328, 11473070] ; Strategic Pioneer Program on Space Sciences, Chinese Academy of Sciences [XDA04076101] ; ISSI ; ESA ; Norwegian Space Center
英文摘要: 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 angstrom. The ratio between the BP intensities measured in 1600 and 1700 angstrom 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 angstrom 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.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6121
Appears in Collections:空间科学部_期刊论文

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