The harmonic amplitude of the non-dipole component increases with time and more quickly in the Southern Hemisphere than that in the Northern, but not an apparent law of periodicity could be confirmed.

• 非偶极子成分的谐波振幅南半球大于北半球，谐波振幅随时间增大，北半球比南半球增加快，振幅变化率南半球比北半球变化强烈，没有明显的周期规律。