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题名: MULTI-WAVELENGTH OBSERVATIONS OF A SUBARCSECOND PENUMBRAL TRANSIENT BRIGHTENING EVENT
作者: Bai, X. Y.; Su, J. T.; Cao, W. D.; Liu, S. Q.; Deng, Y. Y.; Priya, T. G.
作者部门: 空间环境部
通讯作者: Bai, XY (reprint author), Chinese Acad Sci, Space Environm Predict Ctr, Natl Space Sci Ctr, 1 Nanertiao, Beijing 100190, Peoples R China. ; Bai, XY (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, 20 Datun Rd, Beijing 100012, Peoples R China.
关键词: methods: observational ; Sun: chromosphere ; Sun: corona ; Sun: magnetic fields ; Sun: transition region
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2016
卷号: 823, 期号:1, 页码:60
收录类别: SCI
项目资助者: China Postdoctoral Science Foundation ; ESA ; Norwegian Space Centre ; [2011CB8114001] ; [2012CB825606] ; [2011CB811406] ; [KJCX2-EW-T07] ; [11373040] ; [11178005] ; [11273034] ; [11221063] ; [11203036] ; [11303052] ; [11403058] ; [11427803] ; [11373044] ; [11303048] ; [11503063]
英文摘要: We report a subarcsecond penumbral transient brightening event with the high-spatial resolution observations from the 1.6 m New Solar Telescope (NST), Interface Region Imaging Spectrograph (IRIS), and the Solar Dynamics Observatory. The transient brightening, whose thermal energy is in the range of nanoflares, has signatures in the chromosphere, the transient region, and the corona. NST's H alpha channel reveals the fine structure of the event with a width as narrow as 101 km (0 ''.14), which is much smaller than the width from the previous observation. The transient brightening lasts for about 3 minutes. It is associated with a redshift of about 17 km s(-1), found in the Si IV 1402.77 angstrom line and exhibits an inward motion to the umbra with a speed of 87 km s(-1). The small-scale energy released from the event has a multi-temperature component. Spectral analysis of the brightening region from IRIS shows that not only the transition region lines such as Si IV 1402.77 and C II 1334.53 angstrom, but also the chromospheric Mg II k 2796.35 angstrom line are significantly enhanced and broadened. In addition, the event can be found in all the extreme-ultraviolet passbands of the Atmospheric Imaging Assembly and the derived differential emission measure profile increases between 4 and 15 MK (or 6.6 <= log T <= 7.2) in the transient brightening phase. It is possible that the penumbral transient brightening event is caused by magnetic reconnection.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5676
Appears in Collections:空间环境部_期刊论文

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