Interpretation of observations of global electromagnetic resonance by ionosphere non-uniformity localized over the earthquake center

Objective and purpose of the work. We model disturbances in amplitude spectra of vertical electric and horizontal magnetic field components of the signals of global electromagnetic (Schumann) resonance by a seismogenic non-uniformity of the middle atmosphere. The point field source is used positioned at S-E Asia, Africa, or S. America. Observer is found at the Moshiri observatory in Japan (44.37 N, 142.24 E.) and the earthquake modifying the middle atmosphere is situated at Taiwan (21.82 N; 120.81 E). Disturbances are computed in amplitude Schumann resonance spectra and their similarity is demonstrated to observational data. Methods and methodology of work. The propagation parameters of extremely low frequency (ELF) radio waves are found by using the full wave solution in form of Riccati equation. The spectral components of fields are found numerically be using the two dimension telegraph equations having the parameters of regular and non-uniform Earth – ionosphere cavity. Results. We obtain numerical estimates for an impact of localized seismogenic non-uniformity on amplitude spectra of electric and magnetic fields in the frequency band of global electromagnetic (Schumann) resonance. Similarity is demonstrated between the model and observational spectra. Conclusion. The model suggested for a seismogenic non-uniformity in the moddle atmosphere allows to successfully interpret the observations ELF data.

Abstract licence: CC BY

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