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Periodicity of sunspot activity in the modern solar cycles
Li KJ(李可军); Su TW(苏同卫); Liang HF(梁红飞); Li, KJ (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊CHINESE SCIENCE BULLETIN
2004-11
卷号49期号:21页码:2247-2252
DOI10.1360/03wd0154
分类号P182.41
产权排序第1完成单位
收录类别SCI
关键词Sunspot Number Sunspot Area Solar Activity Cycle Period Power Spectrum
摘要Sunspot number, sunspot area and sunspot unit area are usually used to show sunspot activity. In this paper, periodicity of sunspot activity of modern solar cycles has been investigated through analyzing the monthly mean values of the three indices in the time interval of May 1874 to May 2004 by use of the wavelet transform. Their global power spectra and local power spectra are given while the statistical tests of these spectra are taken into account. The main results are (1) the local wavelet power spectrum of the sunspot number seems like that of the sunspot area, indicating that the periodicity of the both indices is similar. The local power spectrum of the sunspot unit area resembles the local power spectra of the previous two indices, but looks more complicated. (2) The possible periods in sunspot activity are about 10.6 (or 10.9 years for the sunspot unit area), 31 and 42 years, and the period of about 10.6 years is statistically significant in the considered time. For the periods of about 31 and 42 years, their power peaks are under the 95% confidence level line but over the mean red-noise, spectral line, and for the other rest periods, their power peaks are even under the mean red-noise spectral line, which are statistically insignificant. (3) The local power of the three periods is higher in the late stage than in the early stage of the considered time. (4) The period characteristics of the three indices, shown in the global power spectra and the local power spectra, are similar but there is difference in detail.
语种英语
学科领域Science & Technology - Other Topics
文章类型Article
ISSN1001-6538
归档日期2004-12-06
WOS记录号WOS:000226326000004
WOS研究方向Science & Technology - Other Topics
WOS类目Multidisciplinary Sciences
关键词[WOS]WAVELET ANALYSIS ; AREAS
引用统计
被引频次:10[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/114a53/6068
专题太阳物理研究组
通讯作者Li, KJ (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
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GB/T 7714
Li KJ,Su TW,Liang HF,et al. Periodicity of sunspot activity in the modern solar cycles[J]. CHINESE SCIENCE BULLETIN,2004,49(21):2247-2252.
APA 李可军,苏同卫,梁红飞,&Li, KJ .(2004).Periodicity of sunspot activity in the modern solar cycles.CHINESE SCIENCE BULLETIN,49(21),2247-2252.
MLA 李可军,et al."Periodicity of sunspot activity in the modern solar cycles".CHINESE SCIENCE BULLETIN 49.21(2004):2247-2252.
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