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SYNCHRONIZATION OF HEMISPHERIC SUNSPOT ACTIVITY REVISITED: WAVELET TRANSFORM ANALYSES
Li KJ(李可军)1; Gao PX(高朋鑫)1,2; Zhan, LS(占腊生)1; Li, K (reprint author), CAS, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
Source PublicationASTROPHYSICAL JOURNAL
2009-01-20
Volume691Issue:1Pages:537-546
DOI10.1088/0004-637X/691/1/537
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Activity Sun: General Sunspots
AbstractThree kinds of wavelet transform methods-continuous wavelet transform, cross-wavelet transform, and wavelet coherence-have been proposed to investigate the phase synchrony of the smoothed monthly mean sunspot areas in the time interval of 1874 May to 2008 March in the solar northern and southern hemispheres. For both time series, the Schwabe cycle is the only period of statistical significance, whose mean value is 10.61 yr. The length of the Schwabe cycle for the smoothed monthly mean sunspot areas in the northern hemisphere actually differs from that in the southern hemisphere, which should lead to phase asynchrony between the two series. Both the cross-wavelet transform and wavelet coherence analyses show an asynchronous behavior with phase mixing in the high-frequency components of hemispheric sunspot activity and a strong synchronous behavior with coherent phase angles in the low-frequency components corresponding to period scales around the Schwabe cycle. Although a phase coherence is found at timescales of about 8.5-13.5 yr (which is similar to those of Donner & Thiel, but within a shorter period), phases are not always coherent at the timescales in the considered time interval. The availability of a physical, meaningful phase definition depends crucially on the appropriate choice of reference frequencies. At the coherent period scales, the leading role is found from those conditions where processes of sunspot formation in the northern hemisphere occur earlier than in the southern one (except some exceptions in several years around the year 1900) during the years of about 1874-1926 to those where the opposite is true during the years of about 1926-1966, and returning back again during the years of about 1966-2008. The mean phase synchronization values at the coherent timescales given by wavelet coherence represent the running trend of the line of synchronization given by a cross-recurrence plot.
Funding OrganizationNSFC [10573034, 10873032, 40636031] ; National Key Research Science Foundation [2006CB806303] ; Chinese Academy of Sciences
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-637X
URL查看原文
Archive Date2009-02-23
WOS IDWOS:000263196600047
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordRECURRENCE PLOTS ; TIME-SERIES ; COHERENCE ; SYSTEMS
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6152
Collection太阳物理研究组
Corresponding AuthorLi, K (reprint author), CAS, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, CAS, Kunming 650011, China
2.Graduate School, CAS, Beijing 100863, China
3.Jingdezhen Ceramic College, Jingdezhen 330001, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li KJ,Gao PX,Zhan, LS,et al. SYNCHRONIZATION OF HEMISPHERIC SUNSPOT ACTIVITY REVISITED: WAVELET TRANSFORM ANALYSES[J]. ASTROPHYSICAL JOURNAL,2009,691(1):537-546.
APA Li KJ,Gao PX,Zhan, LS,&Li, K .(2009).SYNCHRONIZATION OF HEMISPHERIC SUNSPOT ACTIVITY REVISITED: WAVELET TRANSFORM ANALYSES.ASTROPHYSICAL JOURNAL,691(1),537-546.
MLA Li KJ,et al."SYNCHRONIZATION OF HEMISPHERIC SUNSPOT ACTIVITY REVISITED: WAVELET TRANSFORM ANALYSES".ASTROPHYSICAL JOURNAL 691.1(2009):537-546.
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