High-latitude radiation and resonant enhancements of the Jovian synchrotron emissions

A model describing (1) short time scale increases in Jovian synchrotron rad iation and (2) emissions from high Jovian latitudes is presented. In the pr esent model resonant interaction between oblique whistler waves and relativ istic electrons diffuses the energy and the pitch angle of electrons which bounce along the Jovian magnetic field. The resonant interaction violates t he first two adiabatic invariants and the energy diffusion results in harde ning of the electron spectrum and in intensification of the synchrotron rad iation. This model complements the radial diffusion process which (a) Viola tes the third adiabatic invariant of a seed population via interaction with low-frequency magnetospheric oscillations and (b) increases the flux of en ergetic electrons at low L-shells over long time scales by conserving the f irst adiabatic invariant. The high-latitude emissions indicate also acceler ation of bouncing electrons and radiation in the region of the strongest ma gnetic field. The seed particles and whistler waves determine the form of t he electron distribution tail. This tail enhances the high-latitude synchro tron radiation observed at Earth. The resulting emissivities of the nonther mal radio waves in the ordinary/extraordinary modes of propagation, the pol arization and the intensity spectrum observed at Earth due to these high-en ergy populations are calculated (C) 2001 Elsevier Science Ltd. All rights r eserved.