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Analysis on electromagnetic wave propagation in lithosphere-atmosphere system

The propagation problem of electromagnetic wave in lithosphere-atmosphere system under the consideration of an idealized model and current density source underground is analyzed by electromagnetic field theory. Theoretical and numerical analysis reveals that: the discrete eigenvalues depend on the dispersion relation and the source frequency, and play an important role in the propagation characteristics of electromagnetic waves in lithosphere-atmosphere system; the fields along vertical direction attenuate rapidly in the lithospheric regions, but the amplitude attenuation is very small even in very large horizontal scale; and all the fields are almost independent of source type and source width under the condition that the total energies of the sources are kept consistent. The results can improve the understanding of electromagnetic wave characteristics in lithosphere-atmosphere system, and will be applied to many related areas of geological exploration and seismic-electromagnetic monitoring.