The results indicate that the geomagneticdipole 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。
2
With geomagnetic field model records, several kinds of secular variation of geomagneticdipole moment and the position of the geomagnetic North Pole during the year 0 ~ 2000 a.
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。
3
The magnetic leakage field distribution above linear defects of a tube sample under the geomagnetic field was modeled according to magnetic dipole theory.