A MODEL OF CONVECTION AND COROTATION IN JUPITER MAGNETOSPHERE - ULYSSES PREDICTIONS

The Ulysses Jupiter encounter will include the first spacecraft pass through the dusk magnetosphere and will allow new tests of Jovian convection and corotation models. The Cheng and Krimigis [1989] model is extended to suggest that corotation lag occurs principally within the magnetodisk proper, which extends out to approximately 60-70 R(J). It is predicted that outside this radius, in the pre-midnight sector, spin-up to near corotation may occur owing to a local reduction in the outward mass transport rate. The mass loss may occur mainly in the dawn sector, to the magnetospheric wind and the dawn magnetosheath.