A NEW MAGNETIC PUMPING ACCELERATOR OF CHARGED-PARTICLES IN JUPITER MAGNETOSPHERE

This paper proposes an acceleration mechanism to explain the observati ons of energetic particles in the inner magnetosphere of Jupiter. In t he inner magnetosphere particles are convected towards and away from t he Io plasma torus by the centrifugally driven interchange mode or by the longitudinal asymmetry of the magnetosphere and the Io plasma toru s. They experience a varying (space-dependent in Jupiter's frame of re ference) magnetic field and are subject to pitch-angle scattering by w ave-particle interactions. Thus, an e-fold magnetic pumping accelerati on is expected in the system. The calculations show that the accelerat or can generate up to one MeV energy particles in about 10-15 times th e characteristic convection time.