太阳黑子数与电离层TEC的相关性分析

Correlation analysis between sunspot and TEC

为了研究电离层TEC与太阳黑子数在短周期上的相关关系,采用1997～2004年的太阳黑子数资料与同期厦门站的电离层TEC数据,利用小波功率谱分析的方法提取3个尺度的短周期,并利用小波相干谱的方法重点研究了两者在27.8d周期上的相关性。研究表明:太阳黑子数和电离层TEC主要存在准27d、准半年周期以及年周期等短周期,而且电离层TEC和太阳黑子在准27d周期上有良好的相关性。位相计算表明,电离层TEC的变化滞后于太阳黑子数2～3d。厦门地区TEC与太阳活动的相关性在夏季比其他季节更强,这对提高该地区电离层TEC预报精度有很大意义。

To investigate the relationship of short period between TEC（total electron content） and the sun- spot numbers, the sunspot numbers data and TEC data in Xiamen from 1997 to 2004 were used. Wavelet analysis was used to compare the power spectrum of them and the wavelet coherence method to analyze the correlation in differrent periods, and then three periods were extracted and the 27.8-day period correlation was investigated especially. The results show that both the sunspot numbers and TEC mainly have quasi- 27-day, semiyearly and annual period. In the quasi-27-day period, they represent strong correlation. Phase calculation illuminates that the average time delay which the variation of TEC lags behind the sunspot numbers is about 2~3 days. Furthermore, the correlation in summer is more stronger than that in winter in Xiamen district. This is of much importance to the improvment of the accuracy of TEC prediction.