Ion measurements in the Jovian magnetosphere by the ULYSSES EPAC experiment: A comparison between dawn and dusk sectors

Details Ion measurements in the Jovian magnetosphere by the ULYSSES EPAC experiment: A comparison between dawn and dusk sectors Ion measurements in the Jovian magnetosphere by the ULYSSES EPAC experiment: A comparison between dawn and dusk sectors

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16..183k&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 16, no. 4, p. (4)183-(4)186

Computer Science

1

Abundance, Anisotropy, Helium, Ion Density (Concentration), Jupiter (Planet), Magnetic Variations, Oxygen, Planetary Magnetospheres, Corotation, Counter Rotation, Magnetic Field Configurations, Proton Density (Concentration), Ulysses Mission

Scientific paper

We report from the energetic particle composition instrument (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 He/O with increasing latitude in the inner magnetosphere suggests the ionosphere as an internal He-source. (4) We find a difference in the He/O-ratio between the day- and the dusk side of the magnetosphere.

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