Rapid Buildup of a Magnetic Flux Rope during a Confined X2.2 Class Flare in NOAA AR 12673

doi:10.3847/2041-8213/aae826

CORC > 国家天文台 > 中国科学院国家天文台

	Rapid Buildup of a Magnetic Flux Rope during a Confined X2.2 Class Flare in NOAA AR 12673
	Liu, Lijuan 2; Cheng, Xin 3; Wang, Yuming 1; Zhou, Zhenjun 2; Guo, Yang 3; Cui, Jun 2,4
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2018-11-01
卷号	867 期号:1 页码:8
关键词	Sun: activity Sun: corona Sun: coronal mass ejections (CMEs) Sun: flares Sun: magnetic fields
ISSN号	2041-8205
DOI	10.3847/2041-8213/aae826
英文摘要	Magnetic flux ropes (MI-Rs) are believed to be the core structure in solar eruptions; nevertheless, their formation remains intensely debated. Here we report a rapid buildup process of an MFR system during a confined X2.2 class flare occurred on 2017 September 6 in NOAA active region (AR) 12673, three hours after which the structure erupted to a major coronal mass ejection (CME) accompanied by an X9.3 class flare. For the X2.2 flare, we do not find extreme ultraviolet dimmings, separation of its flare ribbons, or clear CME signatures, suggesting a confined flare. For the X9.3 flare, large-scale dimmings, separation of flare ribbons, and a CME show it to be eruptive. By performing a time sequence of nonlinear force-free fields extrapolations we find the following. Until the eruptive flare, an MFR system was located in the AR. During the confined flare, the axial flux and the lower bound of the magnetic helicity for the MFR system were dramatically enhanced by about 86% and 260%, respectively, although the mean twist number was almost unchanged. During the eruptive flare, the three parameters were all significantly reduced. The results evidence the buildup and release of the MFR system during the confined and the eruptive flare, respectively. The former may be achieved by flare reconnection. We also calculate the pre-flare distributions of the decay index above the main polarity inversion line and find no significant difference. It indicates that the buildup of the magnetic flux and helicity of the MFR system may play a role in facilitating its final eruption.
资助项目	Open Project of CAS Key Laboratory of Geospace Environment ; NSFC[11803096] ; NSFC[11722325] ; NSFC[11733003] ; NSFC[11790303] ; NSFC[11790300] ; NSFC[41525015] ; NSFC[41774186] ; Jiangsu NSF[BK20170011] ; "Dengfeng B" program of Nanjing University ; fundamental research funds for the central universities[020114380028]
WOS关键词	CORONAL MASS EJECTIONS ; SOLAR ATMOSPHERE ; EMERGENCE ; TUBE ; INSTABILITY ; FIELDS ; MODEL
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000448516900002
资助机构	Open Project of CAS Key Laboratory of Geospace Environment ; Open Project of CAS Key Laboratory of Geospace Environment ; NSFC ; NSFC ; Jiangsu NSF ; Jiangsu NSF ; "Dengfeng B" program of Nanjing University ; "Dengfeng B" program of Nanjing University ; fundamental research funds for the central universities ; fundamental research funds for the central universities ; Open Project of CAS Key Laboratory of Geospace Environment ; Open Project of CAS Key Laboratory of Geospace Environment ; NSFC ; NSFC ; Jiangsu NSF ; Jiangsu NSF ; "Dengfeng B" program of Nanjing University ; "Dengfeng B" program of Nanjing University ; fundamental research funds for the central universities ; fundamental research funds for the central universities ; Open Project of CAS Key Laboratory of Geospace Environment ; Open Project of CAS Key Laboratory of Geospace Environment ; NSFC ; NSFC ; Jiangsu NSF ; Jiangsu NSF ; "Dengfeng B" program of Nanjing University ; "Dengfeng B" program of Nanjing University ; fundamental research funds for the central universities ; fundamental research funds for the central universities ; Open Project of CAS Key Laboratory of Geospace Environment ; Open Project of CAS Key Laboratory of Geospace Environment ; NSFC ; NSFC ; Jiangsu NSF ; Jiangsu NSF ; "Dengfeng B" program of Nanjing University ; "Dengfeng B" program of Nanjing University ; fundamental research funds for the central universities ; fundamental research funds for the central universities
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/23119]
专题	中国科学院国家天文台
通讯作者	Liu, Lijuan
作者单位	1.Univ Sci & Technol China, CAS Key Lab Geospace Environm, Dept Geophys & Planetary Sci, Hefei 230026, Anhui, Peoples R China 2.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai 519082, Guangdong, Peoples R China 3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China 4.Chinese Acad Sci, CAS Key Lab Lunar & Deep Space Explorat, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Liu, Lijuan,Cheng, Xin,Wang, Yuming,et al. Rapid Buildup of a Magnetic Flux Rope during a Confined X2.2 Class Flare in NOAA AR 12673[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,867(1):8.
APA	Liu, Lijuan,Cheng, Xin,Wang, Yuming,Zhou, Zhenjun,Guo, Yang,&Cui, Jun.(2018).Rapid Buildup of a Magnetic Flux Rope during a Confined X2.2 Class Flare in NOAA AR 12673.ASTROPHYSICAL JOURNAL LETTERS,867(1),8.
MLA	Liu, Lijuan,et al."Rapid Buildup of a Magnetic Flux Rope during a Confined X2.2 Class Flare in NOAA AR 12673".ASTROPHYSICAL JOURNAL LETTERS 867.1(2018):8.