LARGE-AMPLITUDE MAGNETIC PULSES DOWNSTREAM OF THE JOVIAN BOW SHOCK - ULYSSES OBSERVATIONS

We report the first finding of large-amplitude magnetic pulses in the Jovian magnetosheath. The pulses are highly compressional with DELTA\B \/\B\ ranging from 0.5 to 2.0. Each pulse contains a full 360-degrees phase rotation. These solitary waves are propagating at an angle nearl y orthogonal to the ambient magnetic field (theta(kB) > 83-degrees). A determination of the sense of rotation about B0 therefore cannot be m ade. The waves are elliptically polarized. The scale size of the pulse s is approximately 8-17 proton gyroradii ii the plasma frame. We compa re these Jovian pulses with similar phenomena occurring at Earth (shor t large-amplitude magnetic structures: SLAMS) and at comet Giacobini-Z inner.