EXO-PLASMASPHERIC REFILLING DUE TO PONDEROMOTIVE FORCES INDUCED BY GEOMAGNETIC-PULSATIONS

The effect of exo-plasmaspheric refilling due to ponderomotive forces induced by geomagnetic pulsations is considered. It is shown that two maxima of high-density cold plasma can appear on field lines near the dayside magnetospheric boundary, located symmetrically with respect to the equator. When moving away from the noon meridional plane the plas ma density distribution along the field line undergoes a smooth transi tion from two off-equatorial maxima to one maximum at the equator. We calculate the plasma condensation due to the ponderomotive forces in t his region. On the other bend, the satellite data have shown that exo- plasmaspheric Pc1 pulsations have a maximum in the noon-dusk sector. T hese facts bring us to a conclusion that the formation of high-density cold plasma outside plasmasphere in the magnetospheric trough in the noon-dusk sector may be accelerated by ponderomotive effects of Pc1 pu lsations.