A statistical study on rotating sunspots: Polarities, rotation directions, and helicities

doi:10.1086/590953

YNAO OpenIR > 太阳物理研究组

	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
DOI	10.1086/590953
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
ISSN	2041-8205
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
引用统计	被引频次：37[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
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,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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