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A statistical study on rotating sunspots: Polarities, rotation directions, and helicities
Yan XL(闫晓理)1,2; Qu ZQ(屈中权)1; Xu, CL3; Yan, XL (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2008-07-20
卷号682期号:1页码:L65-L68
DOI10.1086/590953
产权排序第1完成单位
收录类别SCI
关键词Sunspots
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
学科领域Astronomy & Astrophysics
文章类型Article
ISSN2041-8205
URL查看原文
归档日期2008-07-26
WOS记录号WOS:000257662700017
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]VECTOR MAGNETIC-FIELDS ; SOLAR ACTIVE REGIONS ; MISSION ; SURFACE ; FLARES ; CYCLE ; TWIST
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被引频次:34[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/114a53/6122
专题太阳物理研究组
通讯作者Yan, XL (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
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
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Yan XL,Qu ZQ,Xu, CL,et al. A statistical study on rotating sunspots: Polarities, rotation directions, and helicities[J]. ASTROPHYSICAL JOURNAL LETTERS,2008,682(1):L65-L68.
APA Yan XL,Qu ZQ,Xu, CL,&Yan, XL .(2008).A statistical study on rotating sunspots: Polarities, rotation directions, and helicities.ASTROPHYSICAL JOURNAL LETTERS,682(1),L65-L68.
MLA Yan XL,et al."A statistical study on rotating sunspots: Polarities, rotation directions, and helicities".ASTROPHYSICAL JOURNAL LETTERS 682.1(2008):L65-L68.
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