Long-term variations of solar activity

查看全文 作　　者：YIN [1,2]ZhiQiang;MA [1]LiHua;HAN [1]YanBen;HAN [1]YongGang

机构地区：[1]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;[2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Science Bulletin》索引2007年第52卷第20期,共5页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 10373017) 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 14C concentration in tree-rings, recon- structed 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. 关键词：太阳活跃性太阳黑子光谱分析光波传播

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Long-term variations of solar activity

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