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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; Jiang, YC (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2012
卷号744期号:1
DOI10.1088/0004-637X/744/1/50
产权排序第1完成单位
收录类别SCI
关键词Sun: Activity Sun: Flares Sunspots Sun: Surface Magnetism
摘要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.
项目资助者973 Program [2011CB811403] ; Natural Science Foundation of China [10973038, 11173058]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2011-12-15
WOS记录号WOS:000298408300050
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CORONAL MASS EJECTIONS ; MAGNETIC-FLUX ROPE ; ACTIVE-REGION ; SOLAR-ACTIVITY ; EMERGENCE ; ENERGETICS ; EVOLUTION ; MODEL ; TUBE ; CONSEQUENCES
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6215
专题太阳物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Jiang, YC (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.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
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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.,...&Jiang, YC .(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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