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Successive X-class Flares and Coronal Mass Ejections Driven by Shearing Motion and Sunspot Rotation in Active Region NOAA 12673
Yan XL(闫晓理)1,2,3; Wang JC(王金成)1,4; Pan, G. M.5; Kong DF(孔德芳)1; Xue ZK(薛志科)1; Yang LH(杨丽恒)1; Li QL(李巧玲)1,4; Feng, X. S.6
发表期刊The Astrophysical Journal
2018-03-27
卷号856期号:1
DOI10.3847/1538-4357/aab153
产权排序第1完成单位
收录类别SCI
关键词Sun: Activity Sun: Coronal Mass Ejections (Cmes) Sun: Flares Sun: Photosphere Sunspots
摘要

Abstract We present a clear case study on the occurrence of two successive X-class flares, including a decade-class flare (X9.3) and two coronal mass ejections (CMEs) triggered by shearing motion and sunspot rotation in active region NOAA 12673 on 2017 September 6. A shearing motion between the main sunspots with opposite polarities began on September 5 and lasted even after the second X-class flare on September 6. Moreover, the main sunspot with negative polarity rotated around its umbral center, and another main sunspot with positive polarity also exhibited a slow rotation. The sunspot with negative polarity at the northwest of the active region also began to rotate counterclockwise before the onset of the first X-class flare, which is related to the formation of the second S-shaped structure. The successive formation and eruption of two S-shaped structures were closely related to the counterclockwise rotation of the three sunspots. The existence of a flux rope is found prior to the onset of two flares by using nonlinear force-free field extrapolation based on the vector magnetograms observed by Solar Dynamics Observatory/Helioseismic and Magnetic Image. The first flux rope corresponds to the first S-shaped structures mentioned above. The second S-shaped structure was formed after the eruption of the first flux rope. These results suggest that a shearing motion and sunspot rotation play an important role in the buildup of the free energy and the formation of flux ropes in the corona that produces solar flares and CMEs.

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
出版者IOP PUBLISHING LTD
ISSN0004-637X
URL查看原文
WOS记录号IOP:0004-637X-856-1-aab153
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/18230
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作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
2.Sate Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, 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, Yuquan Road, Shijingshan Block Beijing 100049, People's Republic of China
5.College of Mathematics Physics and Information Engineering, Jiaxing University, Jiaxing 314001, People's Republic of China
6.SIGMA Weather Group, State Key Laboratory for Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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Yan XL,Wang JC,Pan, G. M.,et al. Successive X-class Flares and Coronal Mass Ejections Driven by Shearing Motion and Sunspot Rotation in Active Region NOAA 12673[J]. The Astrophysical Journal,2018,856(1).
APA Yan XL.,Wang JC.,Pan, G. M..,Kong DF.,Xue ZK.,...&Feng, X. S..(2018).Successive X-class Flares and Coronal Mass Ejections Driven by Shearing Motion and Sunspot Rotation in Active Region NOAA 12673.The Astrophysical Journal,856(1).
MLA Yan XL,et al."Successive X-class Flares and Coronal Mass Ejections Driven by Shearing Motion and Sunspot Rotation in Active Region NOAA 12673".The Astrophysical Journal 856.1(2018).
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