Wavelet analysis of yearly geomagnetic sudden commencement series 地磁急始年发生数周期特征的小波分析
At Beijing Ming Tombs Magnetic Observatory Center, the magnetic sudden commencement is SC, the magnetic main phase duration is shorter and the change is bigger. 北京地磁中心台的磁暴急始为SC型,磁暴主相持续时间较短,变化较大。