This behavior is generally understood to occur when sunward ion drag forsing extends equatorward as the area as the area of the polar cap increases during geomagnetic storms.

переведите позжалста.все не надо а только первую часть.

предыдущее предложение (если нужно) было такое
simulations of such activity have been reported, showing that the normal antisolar zonal wind pattern is replaced by sunward winds in both evening and morning periods.