Abstract:

A simulation study on the effects of particle precipitation on the polar ionosphere was carried out in this paper.It was studied with the aid of a one-dimensional time-dependent ionospheric model self-consistently in the continuity,momentum and energy equations.With the model,flux tubes of plasma were followed in response to convection electric fields.The trajectories,which had been adopted to follow convecting plasma flux tubes was different from each other.When they convected through cusp region,the time that precipitating particle acting on the plasma flux tube was different.The result of simulation draw a conclusion that when the plasma flux tube stayed long enough in cusp region the electron density of ionospheric F layer would remarkably increase,while when the plasma flux tube stayed short in cusp region the electron density of ionospheric F layer would not remarkably increase.The other result was given by this paper from the other view.The assumption was that the precipitating electrons would act on a plasma flux tube,which convect through cusp region,or not.In the two situations the difference would come into being due to time transformation of electron density in the ionospheric F layer.