YNAO OpenIR  > 光纤阵列太阳光学望远镜研究组
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; Su, Yingna(Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China)
发表期刊ASTROPHYSICAL JOURNAL
2018-03-20
卷号856期号:1
DOI10.3847/1538-4357/aaaf68
产权排序第4完成单位
收录类别SCI
关键词Sun: Corona Sun: Magnetic Fields Sun: Filaments Prominences
摘要

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.

项目资助者NSFC(11790304, 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
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
ISSN0004-637X
URL查看原文
WOS记录号WOS:000428455800007
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]Emergence
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12209
专题光纤阵列太阳光学望远镜研究组
通讯作者Su, Yingna(Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China)
作者单位1.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
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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.,...&Su, Yingna.(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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