YIN ZhiQiang; MA LiHua; HAN YanBen; HAN YongGang
Source Publicationchinesesciencebulletin
AbstractUsing 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 C-14 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.
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
YIN ZhiQiang,MA LiHua,HAN YanBen,et al. longtermvariationsofsolaractivity[J]. chinesesciencebulletin,2007,52(20):2737.
APA YIN ZhiQiang,MA LiHua,HAN YanBen,&HAN YongGang.(2007).longtermvariationsofsolaractivity.chinesesciencebulletin,52(20),2737.
MLA YIN ZhiQiang,et al."longtermvariationsofsolaractivity".chinesesciencebulletin 52.20(2007):2737.
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