地磁偶极子
- geomagnetic dipole
地磁偶极子-
过去2000年以来地磁偶极子的长期变化
Secular variation of the geomagnetic dipole over the past 2000 years
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结果表明，地磁偶极子磁矩变化率、功率谱变化率以及非偶极子磁场各阶球谐系数的平均漂移速率均存在60a左右的周期。
The results indicate that there is a periodicity about 60 years for the change rates of geomagnetic parameters , including geomagnetic moment , the spatial power spectrum and the average drift rate of spherical harmonic coefficients with different orders of the non-dipole magnetic field .