Ionospheric effects from different seismogenic electric field sources

The results of numerical simulations of the impact of different seismogenic electric field sources on TEC (Total Electron Content) of the ionosphere are presented. The external electric currents flowing between the faults and the ionosphere were used as lower boundary condition for the electric potential equation of the UAM (Upper Atmosphere Model). Different configurations and magnitudes of these currents were investigated. According to the UAM calculations, the vertical electric current with density of about 2×10^-8 A/m² over the earthquake epicenter area of about ~200 km × ~4000 km may create electric fields generating the observed TEC increases up to ~50%.