Galileo Heavy Ion Radiation Model

Details Galileo Heavy Ion Radiation Model Galileo Heavy Ion Radiation Model

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm23a0301e&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM23A-0301

Physics

2104 Cosmic Rays, 2114 Energetic Particles (7514), 2720 Energetic Particles: Trapped, 2774 Radiation Belts, 7514 Energetic Particles (2114)

Scientific paper

From 1995 to 2003, the Galileo Heavy Ion Counter (HIC) monitored the high energy (~6 to greater than 200 MeV/nucl), 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 a late addition to the Galileo spacecraft and added primarily as an engineering experiment. It was based on a re-engineered Voyager Cosmic Ray System instrument. HIC was added in part to gain a much better understanding of the heavy ion radiation environment at Jupiter than that given by the brief flyby missions of Pioneer and Voyager. These spacecraft found Oxygen and Sulfur to be the primary constituents in the heavy ion environment at Jupiter. This study 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. Here, after a brief review of the instrument and its measurements, we present models of the average and worst case spectra of these heavy ions. This "HIC Model" is then used to generate a model of the SEU environment for Jupiter orbiting spacecraft. The model and its derivatives developed in this and related studies by our group have been successfully used to generate the total dose and single event effect environments for a sample mission to Europa, some results of which are presented here.

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