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题名:
Rapid rotation of a sunspot associated with flares
作者: Yan XL(闫晓理)1,2; Qu ZQ(屈中权)1
刊名: ASTRONOMY & ASTROPHYSICS
出版日期: 2007-06
卷号: 468, 期号:3, 页码:1083-1088
DOI: 10.1051/0004-6361:20077064
学科分类: Astronomy & Astrophysics
产权排序: 第1完成单位
收录类别: SCI ; EI
通讯作者: Yan, XL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Yunnan, Peoples R China.
关键词: Sun : sunspots ; Sun : flares ; Sun : magnetic fields
英文摘要: 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
原文出处: 查看原文
ISSN号: 0004-6361
文章类型: Article
归档日期: 2007-06-08
WOS标题词: Science & Technology ; Physical Sciences
研究领域[WOS]: Astronomy & Astrophysics
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: ACTIVE-REGION ; MAGNETIC-FIELDS ; CONSEQUENCES ; EVOLUTION ; DYNAMICS ; MISSION ; CORONA
WOS记录号: WOS:000247084400041
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/6105
Appears in Collections:太阳物理研究组_期刊论文

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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

Recommended Citation:
Yan XL,Qu ZQ. Rapid rotation of a sunspot associated with flares[J]. ASTRONOMY & ASTROPHYSICS,2007,468(3):1083-1088.
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