geomagnetic variation

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。

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。

Theory, observation and application of the geomagnetic polarity reversal and secular variation, magnetostratigraphy;

地磁场倒转和长期变的理论、观测和应用以及磁性地层学；

The selection of base value is critical to the geomagnetic diurnal variation correction in Marine magnetic survey.

地磁日变基值的选取是海洋磁力测量地磁日变改正的重要内容。

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。

No anomalous local secular geomagnetic variation has been found in the area.

测区内未发现有局部地磁长期变化异常。

According to the observation data at Guangzhou geomagnetic observatory from 1958 to 1995, we summarize the laws of the geomagnetic secular variation in Guangzhou geomagnetic observatory.

本文利用1958 ~ 1995年已正式出版的《地磁观测报告》资料对广州地磁台地磁场的长期变化进行分析研究。

According to observation data at geomagnetic stations in Hebei Province from 1986 to 2005, we sum up and analyze the laws of the geomagnetic secular variation in this paper.

利用河北省地磁台1986 ~ 2005年的地磁观测资料，对该地区地磁场长期变化规律进行总结分析。