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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.
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2008-07-20
Volume682Issue:1Pages:L65-L68
DOI10.1086/590953
Contribution Rank第1完成单位
Indexed BySCI
KeywordSunspots
AbstractObservations 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.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN2041-8205
URL查看原文
Archive Date2008-07-26
WOS IDWOS:000257662700017
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordVECTOR MAGNETIC-FIELDS ; SOLAR ACTIVE REGIONS ; MISSION ; SURFACE ; FLARES ; CYCLE ; TWIST
Citation statistics
Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6122
Collection太阳物理研究组
Corresponding AuthorYan, XL (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
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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