Using the short-period conversion function and extracting local anomaly from the geomagnetic field, we have re-studied the variation of the geomagnetic field before and after the Heze 5.9 earthquake.
本文使用地磁短周期转换函数和提取地磁局部异常的方法，对菏泽5.9级地震前后地磁场的变化进行了再研究。
Using the 10th International geomagnetic Reference Field (IGRF) models, the latitudinal distribution of harmonic amplitude and its time-variation of geomagnetic potential are investigated.
利用第10代国际参考地磁场模型(IGRF)的资料，研究了地磁位的谐波振幅的纬度分布及其时间变化。
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.
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。
The daily variation in properties of the Earth, such as the temperature or the local geomagnetic field, or the daily change in sunlight.
地球各种特征每天的变化，如温度、局部地磁场每天的变化、以及阳光每天的变化。
Results shown the continued attenuation of the dipole moment in the last 50 years, and the variation of spatial spectrum of geomagnetic field continuously decreased.
研究中发现最近50年偶极矩仍在继续衰减，空间功率谱的变化也呈减小趋势。
Results shown the continued attenuation of the dipole moment in the last 50 years, and the variation of spatial spectrum of geomagnetic field continuously decreased.
研究中发现最近50年偶极矩仍在继续衰减，空间功率谱的变化也呈减小趋势。
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