Rapid rotation of a sunspot associated with flares

doi:10.1051/0004-6361:20077064

YNAO OpenIR > 太阳物理研究组

	Rapid rotation of a sunspot associated with flares
	Yan XL(闫晓理)1,2 ; Qu ZQ(屈中权)1 ; Yan, XL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Yunnan, Peoples R China.
发表期刊	ASTRONOMY & ASTROPHYSICS
	2007-06
卷号	468 期号:3 页码:1083-1088
DOI	10.1051/0004-6361:20077064
产权排序	第1完成单位
收录类别	SCI ; EI
关键词	Sun : Sunspots Sun : Flares Sun : Magnetic Fields
摘要	Context. Active region NOAA 10424 observed on August 5, 2003 is studied in detail by using TRACE, SOHO/MDI, BBSO H alpha monograph, and GOES data. This investigation focuses on the sunspot rotation and its relation with the eruptive phenomena by analyzing the magnetic configuration that the rotation results in. Aims. It is shown that there is a close relationship between the sunspot rotation and the emerging kinked magnetic Omega-loops, where the flares occur. Methods. Through tracing the traceable features motion by using the TRACE white-light images, one can get the rotation velocities of the umbra, the penumbra, the area near the penumbra, and the area far from the penumbra. Furthermore, the evolution of the emerging kinked magnetic Omega-loops and magnetic fields were studied. Results. For the sunspot with positive polarity, the umbra, the penumbra, and the area near the penumbra exhibit a conspicuous counterclockwise rotation. Moreover, the velocities decrease from the umbra through the penumbra to the area near the penumbra. It is interesting that the rotation of the umbra, the penumbra, and the area near the penumbra are opposite to that of the area far from penumbra. The rotation velocities of the umbra, the penumbra, polarity separation, and total magnetic flux increase with time. During the largest event (M1.7/Sn flare), emerging kinked magnetic Omega-loops are observed from TRACE 171 angstrom images. Conclusions. The different rotation speeds of the different parts of the sunspot cause twist, and then the twist is injected through the chromosphere into the corona to trigger the flares.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-6361
URL	查看原文
归档日期	2007-06-08
WOS记录号	WOS:000247084400041
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ACTIVE-REGION ; MAGNETIC-FIELDS ; CONSEQUENCES ; EVOLUTION ; DYNAMICS ; MISSION ; CORONA
引用统计	被引频次：52[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/6105
专题	太阳物理研究组
通讯作者	Yan, XL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Yunnan, Peoples R China.
作者单位	1.Yunnan Astronomical Observatory/National Astronomical Observatories, Chinese Academy of Sciences, Kunming, Yunnan 650011, PR China 2.Graduate School of Chinese Academy of Sciences, Zhongguancun, Beijing, PR China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Yan XL,Qu ZQ,Yan, XL . Rapid rotation of a sunspot associated with flares[J]. ASTRONOMY & ASTROPHYSICS,2007,468(3):1083-1088.
APA	Yan XL,Qu ZQ,&Yan, XL .(2007).Rapid rotation of a sunspot associated with flares.ASTRONOMY & ASTROPHYSICS,468(3),1083-1088.
MLA	Yan XL,et al."Rapid rotation of a sunspot associated with flares".ASTRONOMY & ASTROPHYSICS 468.3(2007):1083-1088.

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