The mechanism by which electron and ion densities change in the ionospheric D region due to the electric current flowing in the atmospheric-ionospheric electric circuit is studied. The current disturbance in this circuit exists over the regions of increased seismic, meteorological, and thunderstorm activity. In the framework of the model, the influence of the electron and ion transportation under the action of the electric field on the formation of a disturbance in the D region and heating of the plasma electron component by the field are considered. The calculation results show that the densities of electrons and ions can change by an order of magnitude at an increase in the current density up to (10-9-10-8) A m-2, the sign of the disturbance depending on the current direction. [PUBLICATION ABSTRACT]
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