| 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.
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2009-01-20 | |
| 卷号 | 691期号:1页码:537-546 |
| DOI | 10.1088/0004-637X/691/1/537 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Sun: Activity Sun: General Sunspots |
| 摘要 | Three 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. |
| 项目资助者 | NSFC [10573034, 10873032, 40636031] ; National Key Research Science Foundation [2006CB806303] ; Chinese Academy of Sciences |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-637X |
| URL | 查看原文 |
| 归档日期 | 2009-02-23 |
| WOS记录号 | WOS:000263196600047 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | RECURRENCE PLOTS ; TIME-SERIES ; COHERENCE ; SYSTEMS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/6152 |
| 专题 | 太阳物理研究组 |
| 通讯作者 | Li, K (reprint author), CAS, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, CAS, Kunming 650011, China 2.Graduate School, CAS, Beijing 100863, China 3.Jingdezhen Ceramic College, Jingdezhen 330001, 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 | 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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