HR: 16:20h
AN: SM12C-02    [PDF]
TI: Galileo Measurements of the Jovian Electron Radiation Environment
AU: * Garrett, H B
EM: Henry.Garrett@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Jun, I
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Ratliff, J M
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Evans, R W
AF: Gibbel Corp., Honolulu Ave., Montrose, CA 91214 United States
AU: Clough, G A
AF: Bates College, 21 Nichols St., Lewiston, ME 04240 United States
AU: McEntire, R W
AF: Applied Physics Laboratory, Johns Hopkins University, John Hopkins Rd., Laurel, MD 20723 United States
AB: The Galileo spacecraft Energetic Particle Detector (EPD) has been used to map Jupiter's trapped electron radiation in the jovian equatorial plane for the range 8 to 16 Jupiter radii (1 jovian radius = 71,400 km). The electron count rates from the instrument were averaged into 10-minute intervals over the energy range 0.2 MeV to 11 MeV to form an extensive database of observations of the jovian radiation belts between Jupiter orbit insertion (JOI) in 1995 and end of mission in 2003. These data were then used to provide differential flux estimates in the jovian equatorial plane as a function of radial distance (organized by magnetic L-shell position). These estimates provide the basis for an omni-directional, equatorial model of the jovian electron radiation environment. The comparison of these results with the original Divine model of jovian electron radiation and their implications for missions to Jupiter will be discussed. In particular, it was found that the electron dose predictions for a representative mission to Europa were about a factor of 2 lower than the Divine model estimates over the range of 100 to 1000 mils (2.54 to 25.4 mm) of aluminum shielding, but exceeded the Divine model by about 50% for thicker shielding for the assumed Europa orbiter trajectories. The findings are a significant step forward in understanding jovian electron radiation and represent a valuable tool for estimating the radiation environment to which jovian science and engineering hardware will be exposed.
UR: http://www.openchannelfoundation.org/projects/GIRE/
DE: 2194 Instruments and techniques
DE: 2720 Energetic particles, trapped
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting