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Block-induced Complex Structures Building the Flare-productive Solar Active Region 12673
Yang, Shuhong1,2; Zhang, Jun1,2; Zhu, Xiaoshuai3; Song, Qiao4
2017-11-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume849Issue:2
AbstractSolar active region (AR) 12673 produced 4 X-class, 27 M-class, and numerous lower-class flares during its passage across the visible solar disk in 2017 September. Our study is to answer the questions why this AR was so flareproductive and how the X9.3 flare, the largest one of the past decade, took place. We find that there was a sunspot in the initial several days, and then two bipolar regions emerged nearby it successively. Due to the standing of the pre-existing sunspot, the movement of the bipoles was blocked, while the pre-existing sunspot maintained its quasi-circular shaped umbra only with the disappearance of a part of penumbra. Thus, the bipolar patches were significantly distorted, and the opposite polarities formed two semi-circular shaped structures. After that, two sequences of new bipolar regions emerged within the narrow semi-circular zone, and the bipolar patches separated along the curved channel. The new bipoles sheared and interacted with the previous ones, forming a complex topological system, during which numerous flares occurred. At the highly sheared region, a great deal of free energy was accumulated. On September 6, one negative patch near the polarity inversion line began to rapidly rotate and shear with the surrounding positive fields, and consequently the X9.3 flare erupted. Our results reveal that the block-induced complex structures built the flare-productive AR and the X9.3 flare was triggered by an erupting filament due to the kink instability. To better illustrate this process, a block-induced eruption model is proposed for the first time.
SubtypeArticle
KeywordSun: Activity Sun: Flares Sun: Magnetic Fields Sun: Photosphere Sunspots
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Natural Science Foundations of China(11673035 ; National Natural Science Foundations of China(11673035 ; Key Programs of the Chinese Academy of Sciences(QYZDJ-SSW-SLH050) ; Key Programs of the Chinese Academy of Sciences(QYZDJ-SSW-SLH050) ; Youth Innovation Promotion Association of CAS(2014043) ; Youth Innovation Promotion Association of CAS(2014043) ; 11533008 ; 11533008 ; 11403044 ; 11403044 ; 41404136 ; 41404136 ; 11373004) ; 11373004) ; National Natural Science Foundations of China(11673035 ; National Natural Science Foundations of China(11673035 ; Key Programs of the Chinese Academy of Sciences(QYZDJ-SSW-SLH050) ; Key Programs of the Chinese Academy of Sciences(QYZDJ-SSW-SLH050) ; Youth Innovation Promotion Association of CAS(2014043) ; Youth Innovation Promotion Association of CAS(2014043) ; 11533008 ; 11533008 ; 11403044 ; 11403044 ; 41404136 ; 41404136 ; 11373004) ; 11373004)
DOI10.3847/2041-8213/aa9476
WOS KeywordCORONAL MASS EJECTIONS ; MAGNETIC-FIELD ; EMERGING FLUX ; RECONNECTION ; CANCELLATION ; SUNSPOT ; EMERGENCE ; EVOLUTION ; ERUPTIONS ; EVENT
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundations of China(11673035 ; National Natural Science Foundations of China(11673035 ; Key Programs of the Chinese Academy of Sciences(QYZDJ-SSW-SLH050) ; Key Programs of the Chinese Academy of Sciences(QYZDJ-SSW-SLH050) ; Youth Innovation Promotion Association of CAS(2014043) ; Youth Innovation Promotion Association of CAS(2014043) ; 11533008 ; 11533008 ; 11403044 ; 11403044 ; 41404136 ; 41404136 ; 11373004) ; 11373004) ; National Natural Science Foundations of China(11673035 ; National Natural Science Foundations of China(11673035 ; Key Programs of the Chinese Academy of Sciences(QYZDJ-SSW-SLH050) ; Key Programs of the Chinese Academy of Sciences(QYZDJ-SSW-SLH050) ; Youth Innovation Promotion Association of CAS(2014043) ; Youth Innovation Promotion Association of CAS(2014043) ; 11533008 ; 11533008 ; 11403044 ; 11403044 ; 41404136 ; 41404136 ; 11373004) ; 11373004)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000414266100003
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20200
Collection太阳物理研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
3.Max Planck Inst Solar Syst Res, D-37077 Gottingen, Germany
4.China Meteorol Adm, Natl Ctr Space Weather, Key Lab Space Weather, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Yang, Shuhong,Zhang, Jun,Zhu, Xiaoshuai,et al. Block-induced Complex Structures Building the Flare-productive Solar Active Region 12673[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,849(2).
APA Yang, Shuhong,Zhang, Jun,Zhu, Xiaoshuai,&Song, Qiao.(2017).Block-induced Complex Structures Building the Flare-productive Solar Active Region 12673.ASTROPHYSICAL JOURNAL LETTERS,849(2).
MLA Yang, Shuhong,et al."Block-induced Complex Structures Building the Flare-productive Solar Active Region 12673".ASTROPHYSICAL JOURNAL LETTERS 849.2(2017).
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