Physics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105.7775c&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A4, p. 7775-7782
Physics
5
Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Magnetosphere Interactions With Satellites And Rings, Planetology: Solar System Objects: Jovian Satellites
Scientific paper
The heavy ion counter (HIC) on the Galileo spacecraft consists of two low-energy telescopes that were proof-test models of the telescopes used for the cosmic ray subsystem (CRS) on Voyager. The telescopes on HIC were improved to better withstand the intense radiation environment of the Jovian system and to measure higher-energy particles with greater sensitivity. The similarity of these two instruments makes it natural to compare the data in an effort to glean insight on the behavior of heavy ion fluxes at higher energies and how the inner Jovian magnetosphere has changed in the last 18 years. Inside L=6, the oxygen spectrum suggests a spectral break at ~7500 MeV/Gauss, corresponding to ions with gyroradii of ~1.5RIo at L=6. A comparison of the phase space densities show remarkable agreement between the two time periods outside of the Io orbit, with differential spectra consistent with γ~-8 above ~6 MeV/nucleon. Near Io Galileo observed a large density gradient not apparent in the Voyager data that may be due to local time asymmetries or a decrease in the radial diffusion rate.
Cohen Christina Mae S.
Cooper John F.
Garrard Thomas L.
Gehrels Neil
Murphy Neil
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