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题名:
Spectral and Imaging Observations of a Current Sheet Region in a Small-scale Magnetic Reconnection Event
作者: 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
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2018-05-01
卷号: 858, 期号:1
DOI: 10.3847/2041-8213/aabe77
学科分类: 天文学
产权排序: 第1完成单位
收录类别: SCI
通讯作者: Xue ZK(薛志科), Email: zkxue@ynao.ac.cn
关键词: magnetic reconnection ; Sun: activity ; Sun: magnetic fields ; Sun: transition region
英文摘要: 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.
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
语种: 英语
原文出处: 查看原文
ISSN号: 2041-8205
文章类型: Article
WOS标题词: Science & Technology ; Physical Sciences
研究领域[WOS]: Astronomy & Astrophysics
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: SOLAR-FLARE ; SPECTROSCOPIC OBSERVATIONS ; CME ; TELESCOPE ; EVOLUTION ; ERUPTION ; DENSITY ; SDO
WOS记录号: WOS:000431056800001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12367
Appears in Collections:抚仙湖太阳观测站_期刊论文

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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

Recommended Citation:
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).
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