Long-term variations of solar activity

	Long-term variations of solar activity
	Yin ZhiQiang; Ma LiHua; Han YanBen ; Han YongGang
刊名	CHINESE SCIENCE BULLETIN
	2007-10-01
卷号	52 期号:20 页码:2737-2741
关键词	solar activity sunspot Lomb-Scargle spectrum analysis wavelet transform
英文摘要	Using the Lomb-Scargle periodogram we analyzed two sunspot series: the one over the past 11000 years at the 10-year interval based upon the survey data of (14)C concentration in tree-rings, reconstructed by Solanki et al.; and the sunspot number over the past 7000 years, derived from geomagnetic variations by Usoskin et al. We found the periods and quasi-periods in solar activity, such as about 225, 352, 441, 522 and 561 a, and near 1000 and 2000 a. An approach of wavelet transform was applied to check the two sunspot time series, with emphasis on investigating time-varying characteristics in the long-term fluctuations of solar activity. The results show that the lengths and amplitudes of the periods have changed with time, and large variations have taken place during some periods.
收录类别	SCI
语种	英语
WOS记录号	WOS:000249986200001
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7294]
专题	国家天文台_应用天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Grad Univ, Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Yin ZhiQiang,Ma LiHua,Han YanBen,et al. Long-term variations of solar activity[J]. CHINESE SCIENCE BULLETIN,2007,52(20):2737-2741.
APA	Yin ZhiQiang,Ma LiHua,Han YanBen,&Han YongGang.(2007).Long-term variations of solar activity.CHINESE SCIENCE BULLETIN,52(20),2737-2741.
MLA	Yin ZhiQiang,et al."Long-term variations of solar activity".CHINESE SCIENCE BULLETIN 52.20(2007):2737-2741.