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Diagnosing the Magnetic Field Structure of a Coronal Cavity Observed during the 2017 Total Solar Eclipse
Chen, Yajie1; Tian, Hui1; Su, Yingna2,3; Qu ZQ(屈中权)4; Deng LH(邓林华)4; Jibben, Patricia R.5; Yang, Zihao1; Zhang, Jingwen1; Samanta, Tanmoy1; He, Jiansen1; Wang, Linghua1; Zhu, Yingjie1; Zhong Y(钟悦)4; Liang Y(梁昱)4
Source PublicationASTROPHYSICAL JOURNAL
2018-03-20
Volume856Issue:1
DOI10.3847/1538-4357/aaaf68
Contribution Rank第4完成单位
Indexed BySCI
KeywordSun: Corona Sun: Magnetic Fields, Prominences Sun: Filaments
Abstract

We present an investigation of a coronal cavity observed above the western limb in the coronal red line Fe X 6374 angstrom using a telescope of Peking University and in the green line Fe XIV 5303 angstrom using a telescope of Yunnan Observatories, Chinese Academy of Sciences, during the total solar eclipse on 2017 August 21. A series of magnetic field models is constructed based on the magnetograms taken by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory (SDO) one week before the eclipse. The model field lines are then compared with coronal structures seen in images taken by the Atmospheric Imaging Assembly on board SDO and in our coronal red line images. The best-fit model consists of a flux rope with a twist angle of 3.1 pi, which is consistent with the most probable value of the total twist angle of interplanetary flux ropes observed at 1 au. Linear polarization of the Fe XIII 10747 angstrom line calculated from this model shows a "lagomorphic" signature that is also observed by the Coronal Multichannel Polarimeter of the High Altitude Observatory. We also find a ring-shaped structure in the line-of-sight velocity of Fe XIII 10747 angstrom, which implies hot plasma flows along a helical magnetic field structure, in the cavity. These results suggest that the magnetic structure of the cavity is a highly twisted flux rope, which may erupt eventually. The temperature structure of the cavity has also been investigated using the intensity ratio of Fe XIII 10747 angstrom and Fe X 6374 angstrom.

Funding ProjectNSFC[11790304 (11790300) ] ; NSFC[11790300] ; NSFC[11373065] ; NSFC[11527804] ; NSFC[11473071] ; NSFC[41574166] ; NSFC[41574168] ; NSFC[41421003] ; NSFC[U1731241] ; NSFC[41231069] ; Recruitment Program of Global Experts of China ; One Hundred Talent Program of CAS ; Strategic Pioneer Program on Space Science, CAS[XDA15052200] ; Max Planck Partner Group program ; NCAR/HAO ; National Science Foundation
Funding OrganizationNSFC[11790304 (11790300) , 11790300, 11373065, 11527804, 11473071, 41574166, 41574168, 41421003, U1731241, 41231069] ; Recruitment Program of Global Experts of China ; One Hundred Talent Program of CAS ; Strategic Pioneer Program on Space Science, CAS[XDA15052200] ; Max Planck Partner Group program ; NCAR/HAO ; National Science Foundation
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
ISSN0004-637X
URL查看原文
WOS IDWOS:000428455800007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordEmergence
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12209
Collection光纤阵列太阳光学望远镜研究组
Corresponding AuthorTian, Hui
Affiliation1.School of Earth and Space Sciences, Peking University, Beijing 100871, People's Republic of China
2.Key Laboratory for Dark Matter and Space Science, Purple Mountain Observatory, CAS, Nanjing 210008, People's Republic of China
3.School of Astronomy and Space Science, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
5.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Recommended Citation
GB/T 7714
Chen, Yajie,Tian, Hui,Su, Yingna,et al. Diagnosing the Magnetic Field Structure of a Coronal Cavity Observed during the 2017 Total Solar Eclipse[J]. ASTROPHYSICAL JOURNAL,2018,856(1).
APA Chen, Yajie.,Tian, Hui.,Su, Yingna.,Qu ZQ.,Deng LH.,...&Liang Y.(2018).Diagnosing the Magnetic Field Structure of a Coronal Cavity Observed during the 2017 Total Solar Eclipse.ASTROPHYSICAL JOURNAL,856(1).
MLA Chen, Yajie,et al."Diagnosing the Magnetic Field Structure of a Coronal Cavity Observed during the 2017 Total Solar Eclipse".ASTROPHYSICAL JOURNAL 856.1(2018).
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