地磁活动指数与太阳活动的小波分析

根据1957—2012年的地磁指数Ap、Dst、AE和太阳活动参数(太阳黑子相对数R与太阳射电流量F10.7)数据,利用小波分析方法研究了地磁活动与太阳活动的关系.结果表明,Ap、Dst、AE指数和太阳活动参数均存在准11 a和准22 a的周期特征.Ap和AE峰值滞后于太阳参数峰值1~2 a;而Dst指数与太阳参数存在近似负相关的关系,但从第21太阳周起逐渐延迟于太阳参数,表明地磁活动受太阳活动影响的滞后性.此外,地磁指数峰值从第20太阳周开始有逐渐下降的趋势,反映了地磁活动对太阳活动的响应减弱.

Wavelet analysis of geomagnetic activity index and solar activity

We have studied the relationship between the geomagnetic and solar activity with the method of wavelet analysis by using the 1957—2012 geomagnetic index Ap,Dst,AE and solar activity index (relative sunspot numbers R,solar radio flux F10.7) data.The results show that 11-years and 22-years cycle characteristics are in the geomagnetic index Ap,Dst,AE,and solar activity index.The peaks of Ap and AE lag behind that of solar activity index 1—2 year(s) and Dst shows an approximately inverse correlation with the solar activity index and tend to show a gradually postpone to the solar activity index in the 21st solar cycle,which indicates the postpone of geomagnetic activity under the influuence of solar activity from the 20th solar cycle.The peak of Dst has shown a tendency of decreasing,indicating its weaker reaction to solar activity.