摘要
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。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。地磁北极位置的移动并不均匀,在纬度方向的变化范围只有10°左右,经度方向变化有255°。
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. The results indicate that the geomagnetic dipole moment is not always kept decreasing over the past 2000 years, but increasing during nearly 400 years. The velocity changing rate of the position of geomagnetic north pole has not been the same during equal time interval, its changing range is about 10° in latitude and 255° in longitude.
出处
《地震地磁观测与研究》
2006年第2期48-50,共3页
Seismological and Geomagnetic Observation and Research
基金
国家自然科学基金项目"地磁长期变化与地球自转十年尺度波动的综合研究"(编号40464001)
关键词
地磁场
磁偶极子
磁矩
长期变化
Geomagnetic field models, geomagnetic dipole, geomagnetic dipole moment, secular variation
