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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
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2018-08-20
Volume863Issue:2Pages:7
DOI10.3847/2041-8213/aad777
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Activity Sun: Atmosphere Sun: Evolution Sun: General Sun: Magnetic Fields
Abstract

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.

Funding ProjectNational 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
Funding OrganizationNational 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
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN2041-8205
URL查看原文
WOS IDWOS:000441751100008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMagnetic-flux ; Boundaries ; Dynamics ; Wind ; Acceleration ; Evolution ; Origin
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/17821
Collection抚仙湖太阳观测站
Corresponding AuthorKong DF(孔德芳)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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