Theory, observation and application of the geomagnetic polarity reversal and secularvariation, 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；
2
According to observation data at geomagnetic stations in Hebei Province from 1986 to 2005, we sum up and analyze the laws of the geomagnetic secularvariation 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。
3
With geomagnetic field model records, several kinds of secularvariation of geomagnetic dipole moment and the position of the geomagnetic North Pole during the year 0 ~ 2000 a.