太阳活动周期的小波分析

Periodicity Analysis of Solar Activity by Wavelet Analyzing Method

运用小波技术对太阳射电流量2800 MHz,太阳黑子数和太阳黑子面积数周期进行分析．其结果表明: (1)这3个系列的数据显示最显著的周期是10．69年,其他周期并不明显．(2)小波功率谱给出了全部时间-周期范围的功率谱变化,它显示了在某个周期处于某个时段的局部功率的变化,小波功率谱分析表明,小于1年的周期仅仅在太阳活动最大期附近比较明显．(3)太阳射电2800 MHz,太阳黑子数和太阳黑子面积数的几个周期(10．69年,5．11年, 155．5天)的小波功率谱比较相似,出现峰值的时间相同;曲线的起伏相似,周期越小,曲线起伏的频率越大．

The wavelet technique is used to analyze the periodicities of the monthly average solar flux at 2800MHz, sunspot numbers, and sunspot areas. Our results show： （1） A common period of monthly average sunspot numbers, sunspot areas, and solar flux at 2800MHz around 10.69 years appears prominently. （2）The wavelet spectrum provides continuous temporal evolution of the entire rang of periods and gives detailed information on the time localization of frequency component,the periodicity of Solar activity less than one year is prominent periodicity only at the period of solar activity maximum. （3） The temporal evolution of wavelet powers corresponding to a few selected periods of 155.5 days, 5.11 years, and 10.69 years in sunspot numbers, sunspot areas, and radio flux at 2800MHz reveals that the wavelet powers of shorter-period oscillations evolve rapidly compared to that of long-period oscillations. The curve of wavelet powers of Rsn, Rsa and Rsf in the periods 155.5 days, 5.11 and 10.69 years are very similar, having almost same fluctuations and the peaks of wavelet powers appearing almost at same times.