Upward acceleration of magnetospheric ions by oscillatory centrifugal force

The paper addresses the issue of upward acceleration of ions along geomagnetic field lines. It has been shown that the ion acceleration mechanism by electric field oscillations (formerly known as magnetic moment «pumping» or MMP) may be treated as a centrifugal acceleration mechanism. More precisely, the case in hand is the oscillatory centrifugal acceleration; this brings up the question about comparison of MMP with the centrifugal acceleration caused by the quasi-static magnetospheric convection field. It has been found that at high geomagnetic latitudes the oscillatory centrifugal force is weaker or stronger than the magne-tospheric convection centrifugal force, if the ratio of the electric field oscillation amplitude to the mean field is correspondingly lower or higher than The analysis of data from measurements and calculations of magnetospheric electric fields suggests that, contrary to current opinion, the oscillatory centrifugal force may be comparable to the magnetospheric convection centrifugal force and even exceed it when strong global Pc5 pulsations are excited in the magnetosphere.