摘要
2004年,Solanki等人利用树木年轮中δ14C含量变化重建的太阳黑子数序列研究太阳活动的论文被Nature发表,该黑子序列自1895年起向历史时期延伸了11400年.本文采用最大熵谱分析方法和小波变换方法分析了这一重建的太阳黑子序列,重点讨论太阳活动在千年尺度上的周期性波动.结果表明,太阳活动的长期变化中存在接近千年和略大于两千年的准周期信号,以及可能存在约7千年的波动,得到了这些准周期分量的参数.这些准周期分量的周期长度和振幅是随着时间变化的,文中给出了它们的时变图象并讨论了它们的时变特征.
Solanki＇s et al. paper on study of secular solar activity using a long reconstruction of the sunspot number based on dendrochronologically dated radiocarbon concentrations （δ^14 C） in tree rings is published in Nature in 2004. The sunspot number series covered the past 11400 years before 1895. In this paper, the authors use the spectrum analysis of the Maximum Entropy Method and wavelet transform to analyze the reconstruction series of solar activity, with emphasis on discussing periodic and quasi-periodic fluctuations of secular solar activity on thousand-year time scales. The result showed that the quasi-periodic signals of near 1000-year and more than 2000-year at secular variation of solar activity, and a fluctuation with about 7000-year appeared in solar activity possibly. The parameters of the quasi-periodic signals are obtained. The length and amplitude of the quasi periodic signals are change with time. Their time-variable images are given and time-variable characteristics existing in these fluctuations are discussed in the paper.
出处
《地球物理学进展》
CSCD
北大核心
2007年第2期446-450,共5页
Progress in Geophysics
基金
国家自然科学基金项目(10373017)资助
关键词
太阳活动
长周期
时变
小波变换
solar activity, long period, time-variation, wavelet transform
