Generation of short-period geomagnetic field oscillations as a result of large-scale disturbances of the ionospheric conductivity

Low ionosphere conductivity disturbance, which is large-scale in horizontal direction, is shown to result in generation of geomagnetic field oscillations within second ones-tens range. Equation of such oscillations and its general solution are obtained. Calculation of oscillations for two special cases of time dependence of ionosphere integral conductivities is conducted. Estimation of geomagnetic pulsation amplitude at the Earth surface is given