Abstract
We report on results from the EPAC experiment on board the Ulysses spacecraft during the Jupiter Flyby in February 1992. We compare ion anisotropies (E = 0.24−0.77 MeV/N) received on the inbound pass in the noon sector at low magnetic latitudes with those from the outbound pass in the dusk sector at high magnetic latitudes. The results can be summarized as follows: (1) The classification of an inner and middle magnetosphere is observed inbound at low magnetic latitudes as well as outbound at high magnetic latitudes. (2) Three-dimensional anisotropies of ions in the noon sector were found in the corotation direction with radial components, whereas in the dusk sector field aligned anisotropies as well as anisotropies in corotation and anti-corotation were observed. (3) The steady increase of HeO with increasing latitude in the inner magnetosphere suggests the ionosphere as an internal He-source. (4) We find a difference in the HeO-ratio between the day- and the dusk side of the magnetosphere.
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