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Observational Evidence of Interchange Reconnection between a Solar Coronal Hole and a Small Emerging Active Region
Kong DF(孔德芳)1; Pan, G. M.2; Yan XL(闫晓理)1,3; Wang JC(王金成)1,3; Li QL(李巧玲)1,4
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2018-08-20
卷号863期号:2页码:7
DOI10.3847/2041-8213/aad777
产权排序第1完成单位
收录类别SCI
关键词Sun: Activity Sun: Atmosphere Sun: Evolution Sun: General Sun: Magnetic Fields
摘要

In this Letter, we present a case study of interchange reconnection between a coronal hole (CH) and a small emerging active region. The small active region emerges at the edge of the CH. Following the emergence of the small active region, the expansion of the arcade loops connecting the negative and the positive polarities of the active region can be clearly seen in 211 and 171 angstrom observations. During the emergence, the active region develops loop connections to the boundary of the CH, leading to its retreat. The latter has fast and slow phases at speeds of about 2.3 km s(-1) and 0.4 km s(-1), respectively. By the end, these newly formed closed loops occupy most of the pre-emergence CH. From the line-of-sight magnetograms observed by Solar Dynamics Observatory/Helioseismic and Magnetic Imager, the magnetic polarity in the CH is mainly positive and the leading sunspot of the active region has negative polarity. It is consistent with the condition of interchange reconnection. Moreover, the potential field source surface model is used to extrapolate the coronal magnetic fields. From a sequence of extrapolation potential fields, it is clear that the open fields in the CH close down, and the closed field at the east of the active region becomes an open field. These observations and the extrapolations of the potential fields suggest that interchange reconnection occurs between the CH and the small emerging active region and is driven by the flux emergence process.

资助项目National Science Foundation of China[11603071] ; National Science Foundation of China[11633008] ; Key Science Foundation of Yunnan Province[Y8YJ061001] ; Youth Innovation Promotion Association of CAS[2011056] ; Group for Innovation of Yunnan Province
项目资助者National Science Foundation of China[11603071, 11633008] ; Key Science Foundation of Yunnan Province[Y8YJ061001] ; Youth Innovation Promotion Association of CAS[2011056] ; Group for Innovation of Yunnan Province
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN2041-8205
URL查看原文
WOS记录号WOS:000441751100008
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]Magnetic-flux ; Boundaries ; Dynamics ; Wind ; Acceleration ; Evolution ; Origin
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17821
专题抚仙湖太阳观测站
通讯作者Kong DF(孔德芳)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People's Republic of China
2.College of Mathematics Physics and Information Engineering, Jiaxing University, Jiaxing 314001, People's Republic of China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of China
4.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
推荐引用方式
GB/T 7714
Kong DF,Pan, G. M.,Yan XL,et al. Observational Evidence of Interchange Reconnection between a Solar Coronal Hole and a Small Emerging Active Region[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,863(2):7.
APA Kong DF,Pan, G. M.,Yan XL,Wang JC,&Li QL.(2018).Observational Evidence of Interchange Reconnection between a Solar Coronal Hole and a Small Emerging Active Region.ASTROPHYSICAL JOURNAL LETTERS,863(2),7.
MLA Kong DF,et al."Observational Evidence of Interchange Reconnection between a Solar Coronal Hole and a Small Emerging Active Region".ASTROPHYSICAL JOURNAL LETTERS 863.2(2018):7.
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