为了提取地壳异常场，必须从观测资料中消除主磁场、磁层场，感应场和电离层场。
In order to get the crustal anomaly field, the main field, magnetospheric, ionospheric and induction fields from the Magsat data must be subtracted.
第五、地震电离层异常扰动研究。
Fifth, ionospheric anomalous disturbances of earthquakes are investigated.
电场沿磁力线传到F_2层，通过“喷泉效应”引起电离层赤道异常的行星波振荡。
The electric field can transfer to F2 region along the geomagnetic field line and by means of the fountain effect it can results in the PSO of the equatorial anomaly.
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