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Temporal variation of hemispheric solar rotation
Xie JL(谢婧岚)1,2; Shi XJ(石祥军)1,2; Xu JC(徐景晨)1,2; Xie, JL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2012-02
Volume12Issue:2Pages:187-200
DOI10.1088/1674-4527/12/2/007
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Activity Sun: Rotation Sun: Sunspot
AbstractThe daily sunspot numbers of the whole disk as well as the northern and southern hemispheres from 1945 January 1 to 2010 December 31 are used to investigate the temporal variation of rotational cycle length through the continuous wavelet transformation analysis method. Auto-correlation function analysis of daily hemispheric sunspot numbers shows that the southern hemisphere rotates faster than the northern hemisphere. The results obtained from the wavelet transformation analysis are that no direct relationship exists between the variation trend of the rotational cycle length and the solar activity in the two hemispheres and that the rotational cycle length of both hemispheres has no significant period appearing at 11 yr, but has a significant period of about 7.6 yr. Analysis concerning the solar cycle dependence of the rotational cycle length shows that acceleration seems to appear before the minimum time of solar activity in the whole disk and the northern hemisphere, respectively. Furthermore, the cross-correlation study indicates that the rotational cycle length of the two hemispheres has different phases, and that the rotational cycle length of the whole disk as well as the northern and southern hemispheres, also has phase shifts with corresponding solar activity. In addition, the temporal variation of the north-south (NS) asymmetry of the rotational cycle length is also studied. This displays the same variation trend as the N-S asymmetry of solar activity in a solar cycle, as well as in the considered time interval, and has two significant periods of 7.7 and 17.5 yr. Moreover, the rotational cycle length and the N-S asymmetry of solar activity are highly correlated. It is inferred that the northern hemisphere should rotate faster at the beginning of solar cycle 24.
Funding OrganizationNational Natural Science Foundation of China [10873032, 10921303, 11073010, 40636031] ; National Basic Research Program of China (973 programs) [2011CB811406, 2012CB957801]
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN1674-4527
URL查看原文
Archive Date2012-07-25
WOS IDWOS:000300762600007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordNORTH-SOUTH ASYMMETRY ; N-S ASYMMETRY ; NUMBERS R-N ; DIFFERENTIAL ROTATION ; SUNSPOT NUMBERS ; WAVELET ANALYSIS ; ACTIVITY CYCLES ; PERIODICITIES ; SUN ; VELOCITY
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6211
Collection太阳物理研究组
Corresponding AuthorXie, JL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories/ Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xie JL,Shi XJ,Xu JC,et al. Temporal variation of hemispheric solar rotation[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(2):187-200.
APA Xie JL,Shi XJ,Xu JC,&Xie, JL .(2012).Temporal variation of hemispheric solar rotation.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(2),187-200.
MLA Xie JL,et al."Temporal variation of hemispheric solar rotation".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.2(2012):187-200.
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