The Galileo Heavy Ion Environment--Update to the HIC Model

Details The Galileo Heavy Ion Environment--Update to the HIC Model The Galileo Heavy Ion Environment--Update to the HIC Model

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm31a0239e&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM31A-0239

Physics

2114 Energetic Particles (7514), 2774 Radiation Belts, 6220 Jupiter, 7514 Energetic Particles (2114), 7984 Space Radiation Environment

Scientific paper

From 1995 to 2003, the Galileo Heavy Ion Counter (HIC) monitored the high energy (~6 to >200 MeV/nuc), heavy ion (6C to 28Ni) fluxes at Jupiter and returned data for all but 2 of the 35 orbits of the Jupiter system. HIC was based on a re-engineered Voyager Cosmic Ray System instrument and was added to gain a better understanding of the heavy ion radiation environment at Jupiter than that given by the brief flyby missions of Pioneer and Voyager. HIC, as did these spacecraft, found Oxygen and Sulfur to be the primary constituents in the heavy ion environment at Jupiter and adds Carbon to the list. The Carbon is believed to be of solar origin while Oxygen is of mixed solar origin and sputtering off the icy moons of Jupiter. Sulfur is Io-genic. In a previous study, a "HIC Model" was generated from the instrument data to provide estimates of the SEU environment for Jupiter orbiting spacecraft. This presentation updates that model and attempts to fit its findings into the overall picture of ion diffusion at Jupiter as presented by Gehrels, Stone, Cohen, and their colleagues.

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