A STUDY OF THE LARGE-SCALE DYNAMICS OF THE JOVIAN MAGNETOSPHERE USINGTHE GALILEO PLASMA-WAVE EXPERIMENT

Using observations of the Galileo PWS experiment, we show that energet ic phenomena recurrently occur in the jovian magnetosphere. They are c haracterized by intensifications of the auroral radio emissions and th e creation of new sources of radiations in the outer regions of the Io torus. Simultaneously, modifications of the structure of the plasmash eet are observed at large distance (more than 60 Rj) from Jupiter. The se large-scale processes, presenting a periodicity of 50 to 80 hours, could be linked to global instabilities of the jovian magnetosphere.