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题名:
A statistical study on rotating sunspots: Polarities, rotation directions, and helicities
作者: Yan XL(闫晓理)1,2; Qu ZQ(屈中权)1; Xu, CL3
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2008-07-20
卷号: 682, 期号:1, 页码:L65-L68
DOI: 10.1086/590953
学科分类: Astronomy & Astrophysics
产权排序: 第1完成单位
收录类别: SCI
通讯作者: Yan, XL (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
关键词: sunspots
英文摘要: Observations of white-light images from SOHO MDI, TRACE, Hinode, SOHO MDI magnetograms, and Hinode SP vector magnetograms show sufficient samples of rotating sunspots on the solar photosphere for a statistical study. During the period from 1996 December to 2007 December, after individually checking the active regions in detail, we found 182 measurable rotating sunspots. According to the statistics, the number of rotating sunspots in the northern hemisphere is 12% greater than the number in the southern hemisphere. The number of rotating sunspots with clockwise rotation is approximately the same as the number with counterclockwise rotation in both hemispheres. Furthermore, in the northern hemisphere the number of rotating sunspots with positive polarity is nearly twice the number of those with negative polarity, while in the southern hemisphere the situation is almost reversed. During the maximum of solar cycle 23, there were more rotating sunspots than during any other period observed. Finally, the current helicity imbalance shows a very weak hemispheric tendency. These findings may be instructive and place further constrains on the dynamo and flux emergence theories.
语种: 英语
原文出处: 查看原文
ISSN号: 2041-8205
文章类型: Article
归档日期: 2008-07-26
WOS标题词: Science & Technology ; Physical Sciences
研究领域[WOS]: Astronomy & Astrophysics
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: VECTOR MAGNETIC-FIELDS ; SOLAR ACTIVE REGIONS ; MISSION ; SURFACE ; FLARES ; CYCLE ; TWIST
WOS记录号: WOS:000257662700017
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/6122
Appears in Collections:太阳物理研究组_期刊论文

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作者单位: 1.National Astronomical Observatories/Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, Yunnan 650011, China
2.Graduate School of the Chinese Academy of Sciences, Zhongguancun, Beijing, China
3.Yunnan Normal University, Kunming, Yunnan, China

Recommended Citation:
Yan XL,Qu ZQ,Xu, CL. A statistical study on rotating sunspots: Polarities, rotation directions, and helicities[J]. ASTROPHYSICAL JOURNAL LETTERS,2008,682(1):L65-L68.
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文件名: A Statistical Study on Rotating Sunspots_ Polarities, Rotation Directions, and Helicities.pdf
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