geomagnetic dipole

Secular variation of the geomagnetic dipole over the past 2000 years

过去2000年以来地磁偶极子的长期变化

The geomagnetic dipole field in the 20th century

二十世纪的地球偶极子磁场

The results indicate that the geomagnetic dipole moment is not always kept decreasing over the past 2000 years , but increasing during nearly 400 years .

结果表明：过去2000年中，地磁场的偶极子磁矩并非一直减小，有近400年的时间是持续增长的。

With geomagnetic field model records , several kinds of secular variation of geomagnetic dipole moment and the position of the geomagnetic north pole during the year 0 ~ 2000 A. D are calculated and analyzed .

利用地磁场模型资料，计算和分析了公元0～2000年的地磁场偶极子磁矩和地磁北极位置的长期变化。