Abstract
In this study, we illustrate the temporal variations of the geoelectric field and geomagnetic field by data from eight geoelectric field stations and four geomagnetic field stations in Mainland China in 2011. The maximum entropy spectral estimation method (MEM) was used to process the data in our study. The results show that: (i) it is obvious seasonal changes at inland geoelectric field stations and monthly changes at coastal geoelectric field stations; (ii) obvious seasonal changes can be observed at geomagnetic field stations and its seasonal changing curve of component H is most similar to that of the geoelectric field; and (iii) monthly changes of geoelectric field are caused by the combined action of solar and lunar tidal forces, and the seasonal changes of geoelectric field are caused by electromagnetic induction of the seasonal changes of ionospheric current induction intensity inside the Earth.
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