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RAPID SUNSPOT ROTATION ASSOCIATED WITH THE X2.2 FLARE ON 2011 FEBRUARY 15
Jiang YC(姜云春)1; Zheng RS(郑瑞生)1,2; Yang JY(杨家艳)1,3; Hong JC(洪俊超)1,2; Bi Y(毕以)1,2; Yang D(杨丹)1,2
Source PublicationASTROPHYSICAL JOURNAL
2012
Volume744Issue:1
DOI10.1088/0004-637X/744/1/50
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Activity Sun: Flares Sunspots Sun: Surface Magnetism
Abstract

We present observations of sunspot evolution associated with the first X-class flare of the present solar cycle 24, which occurred in AR 11158 on 2011 February 15. The active region consisted of four emerging bipoles that showed complicated sunspot motion. The preceding spot of a bipole underwent the fastest movement. It not only passed through the following end of another bipole, thus causing a shearing motion, but also merged with the same-polarity spots and formed a single, larger umbra. This led to the formation of a d configuration with an S-shaped neutral line, above which an extreme ultraviolet filament channel and a sigmoid formed and erupted to produce the flare. Along with the development of a clockwise (CW) spiral penumbra-filament pattern, the merged spot started rapid CW rotation around its umbral center 20 hr before the flare. The rotation persisted throughout the flare but stopped sharply about 1 hr after the flare ended, maintaining the twisted penumbra-filament pattern. The moving spot also caused continuous flux cancellation; in particular, its outer penumbra directly collided with small opposite-polarity spots only 100 minutes before the flare. When the shearing and rotational motions are main contributors to the energy buildup and helicity injection for the flare, the cancellation and collision might act as a trigger. Our observations support the idea that the rotation can be attributed to the emergence of twisted magnetic fields, as proposed in recent theories. Finally, the cause of its sudden halt is discussed.

Funding Project973 Program[2011CB811403] ; Natural Science Foundation of China[10973038] ; Natural Science Foundation of China[11173058]
Funding Organization973 Program[2011CB811403] ; Natural Science Foundation of China[10973038, 11173058]
Language英语
Subject Area天文学 ; 太阳与太阳系 ; 太阳物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
Archive Date2011-12-15
WOS IDWOS:000298408300050
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCORONAL MASS EJECTIONS ; MAGNETIC-FLUX ROPE ; ACTIVE-REGION ; SOLAR-ACTIVITY ; EMERGENCE ; ENERGETICS ; EVOLUTION ; MODEL ; TUBE ; CONSEQUENCES
Citation statistics
Cited Times:46[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6215
Collection太阳物理研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorJiang YC(姜云春)
Affiliation1.National Astronomical Observatory/Yunnan Astronomical Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
2.Graduate School of Chinese Academy of Sciences, Beijing 100049, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Jiang YC,Zheng RS,Yang JY,et al. RAPID SUNSPOT ROTATION ASSOCIATED WITH THE X2.2 FLARE ON 2011 FEBRUARY 15[J]. ASTROPHYSICAL JOURNAL,2012,744(1).
APA Jiang YC,Zheng RS,Yang JY,Hong JC,Bi Y,&Yang D.(2012).RAPID SUNSPOT ROTATION ASSOCIATED WITH THE X2.2 FLARE ON 2011 FEBRUARY 15.ASTROPHYSICAL JOURNAL,744(1).
MLA Jiang YC,et al."RAPID SUNSPOT ROTATION ASSOCIATED WITH THE X2.2 FLARE ON 2011 FEBRUARY 15".ASTROPHYSICAL JOURNAL 744.1(2012).
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