A Study of External Magnetic Reconnection that Triggers a Solar Eruption

doi:10.3847/2041-8213/aa9c40

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	A Study of External Magnetic Reconnection that Triggers a Solar Eruption
	Zhou, G. P.2; Zhang, J.3; Wang, J. X.2; Wheatland, M. S.1
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2017-12-10
卷号	851 期号:1 页码:8
关键词	Sun: activity Sun: atmosphere Sun: evolution Sun: filaments, prominences
ISSN号	2041-8205
DOI	10.3847/2041-8213/aa9c40
英文摘要	External magnetic reconnection (EMR) is suggested to play an essential role in triggering a solar eruption, but is rarely directly observed. Here, we report on a filament eruption on 2014 October 3 that apparently involves the process of an early EMR. A total of 1.7. x. 10(20) Mx lux first canceled along the filament-related polarity inversion line over 12 hr, and then the filament axis started to brighten in extreme ultraviolet (EUV). An impulsive EUV brightening began 30 minutes later, and we attribute this to EMR, as it is located at the center of a bidirectional outflow with a velocity of 60-75 km s(-1) along large-scale magnetic loops from active regions NOAA 12178 and 12179, respectively, and over the filament mentioned above. Following the EMR, the filament was activated; then, partial eruption occurred 6 minutes later in the west, in which the decay index above the magnetic flux rope (MFR) reached the critical value of 1.5. The observations are interpreted in terms of underlying magnetic flux cancelation leading to the buildup and eventual formation of the MFR with a filament embedded in it, and the MFR is elevated later. The activated MFR rises and pushes the overlying sheared field and forms a current sheet causing the EMR. The EMR in turn weakens the constraining effect of the overlying field, leading to the arising of the MFR, and subsequently erupting due to torus instability.
资助项目	National Natural Science Foundation of China[11322329] ; National Natural Science Foundation of China[11533008] ; National Natural Science Foundation of China[11573038] ; Chinese Academy of Science Project[KJCX2-EW-T07] ; NSF[AGS-1156120] ; NSF[AGS-1249270]
WOS关键词	CORONAL MASS EJECTIONS ; ACTIVE-REGION ; NUMERICAL SIMULATIONS ; FLUX TUBES ; FLARES ; FIELDS ; CANCELLATION ; PROMINENCES ; MODEL ; EMERGENCE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000417542100001
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science Project ; Chinese Academy of Science Project ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science Project ; Chinese Academy of Science Project ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science Project ; Chinese Academy of Science Project ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science Project ; Chinese Academy of Science Project ; NSF ; NSF
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/37338]
专题	中国科学院国家天文台
通讯作者	Zhou, G. P.
作者单位	1.Univ Sydney, Sydney Inst Astron, Sch Phys, Sydney, NSW, Australia 2.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China 3.George Mason Univ, Dept Phys & Astron, Fairfax, VA 22030 USA
推荐引用方式 GB/T 7714	Zhou, G. P.,Zhang, J.,Wang, J. X.,et al. A Study of External Magnetic Reconnection that Triggers a Solar Eruption[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,851(1):8.
APA	Zhou, G. P.,Zhang, J.,Wang, J. X.,&Wheatland, M. S..(2017).A Study of External Magnetic Reconnection that Triggers a Solar Eruption.ASTROPHYSICAL JOURNAL LETTERS,851(1),8.
MLA	Zhou, G. P.,et al."A Study of External Magnetic Reconnection that Triggers a Solar Eruption".ASTROPHYSICAL JOURNAL LETTERS 851.1(2017):8.