PROPAGATION OF JOVIAN ELECTRONS IN AND OUT OF THE ECLIPTIC

Since its switch-on in Oct. 90, the Kiel Electron Telescope onboard Ulysses has detected many quiet time increases of the flux of 3-30 MeV electrons, known to originate from Jupiter. We report on the long term variations of this flux for the Ulysses ecliptic journey, and at the beginning of the out of ecliptic phase. They are well accounted for by a simple convection-diffusion model, with diffusion coefficients along and perpendicular to the magnetic field of approximately 5.10(22) and 8.10(20) cm2 s-1 respectively. In addition to the long term flux variations, several short bursts of electrons were detected, particularly after the Jupiter fly-by at southern latitudes. Their duration is about 1 hour or less, and they show a very strong anisotropy in the general direction of Jupiter. They are more numerous and are found at larger distances after encounter (23 of them, up to 0.86 AU from Jupiter), than before (3, up to 0.40 AU).