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Spectral and Imaging Observations of a Current Sheet Region in a Small-scale Magnetic Reconnection Event
Xue ZK(薛志科)1,2; Yan XL(闫晓理)1,2; Yang LH(杨丽恒)1,2; Wang JC(王金成)1,2; Feng, Song3; Li QL(李巧玲)1,2,4; Ji KF(季凯帆)1,2; Zhao L(赵丽)1,2; Xue ZK(薛志科), Email: zkxue@ynao.ac.cn
2018-05-01
发表期刊ASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
卷号858期号:1
产权排序第1完成单位
摘要We report a possible current sheet region associated with a small-scale magnetic reconnection event by using the spectral and imaging observations of the Interface Region Imaging Spectrograph (IRIS) and the magnetograms obtained by the Solar Dynamics Observatory on 2016 August 08. The length and width of the current sheet region are estimated to be from 1.4 +/- 0.1 Mm to 3.0 +/- 0.3 Mm and from 0.34 +/- 0.01 Mm to 0.64 +/- 0.09 Mm, respectively. The evolutions of the length of the current sheet region are positively correlated with that of the width. These measurements are among the smallest reported. When the IRIS slit scans the current sheet region, the spectroscopic observations show that the Si IV line is broadened in the current sheet region and the plasma has a blueshifted feature at the middle and a redshifted feature at the ends of the current sheet region. The maximum measured blueshifted and redshifted Doppler velocities are -20.8 +/- 0.9 and 34.1 +/- 0.4 km s(-1), respectively. Additionally, the electron number densities of the plasma in the current sheet region are computed to be around 10(11) cm(-3) based on the spectrums of the two O IV lines. The emergence, movement, and cancellation of a small sunspot with negative polarity are observed during the formation and shift of the current sheet region. We suggest that the occurrence and evolution of the magnetic reconnection are driven by the movement of the small sunspot in the photosphere.
关键词Magnetic Reconnection Sun: Activity Sun: Magnetic Fields Sun: Transition Region
学科领域天文学
DOI10.3847/2041-8213/aabe77
项目资助者National Science Foundation of China (NSFC)(11503080, 11633008, 11473064, 11463003, 11573012, 11763004) ; CAS "Light of West China" Program ; Youth Innovation Promotion Associated CAS(201156) ; Project of the Group for Innovation of Yunnan Province
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收录类别SCI
语种英语
文章类型Article
WOS研究方向Astronomy & Astrophysics
WOS标题词Science & Technology ; Physical Sciences
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000431056800001
关键词[WOS]SOLAR-FLARE ; SPECTROSCOPIC OBSERVATIONS ; CME ; TELESCOPE ; EVOLUTION ; ERUPTION ; DENSITY ; SDO
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12367
专题抚仙湖太阳观测站
通讯作者Xue ZK(薛志科), Email: zkxue@ynao.ac.cn
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming Yunnan 650216, People's Republic of China
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
3.Yunnan Key Laboratory of Computer Technology Application/Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, People's Republic of China
4.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
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GB/T 7714
Xue ZK,Yan XL,Yang LH,et al. Spectral and Imaging Observations of a Current Sheet Region in a Small-scale Magnetic Reconnection Event[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,858(1).
APA Xue ZK.,Yan XL.,Yang LH.,Wang JC.,Feng, Song.,...&Xue ZK.(2018).Spectral and Imaging Observations of a Current Sheet Region in a Small-scale Magnetic Reconnection Event.ASTROPHYSICAL JOURNAL LETTERS,858(1).
MLA Xue ZK,et al."Spectral and Imaging Observations of a Current Sheet Region in a Small-scale Magnetic Reconnection Event".ASTROPHYSICAL JOURNAL LETTERS 858.1(2018).
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