Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11d..01b&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM11D-01
Physics
6939 Magnetospheric Physics
Scientific paper
Plasma conditions in the Io torus are compared for Voyager 1, Voyager 2, Galileo and Cassini epochs. We find considerable changes in density and composition over time scales of days to years. These changes in plasma conditions are compared with models of physical and chemical processes in the torus. We vary the five main parameters of the chemical model (neutral source strength, oxygen/sulfur ratio of the source, radial transport time, fraction of hot electrons and hot electron temperature) to explore how the resulting equilibrium torus conditions (densities and temperatures of the main species plus the total emitted UV power) depend on the model input. Comparing the model output with observed torus conditions indicate Voyager 1 conditions are intermediate between Voyager 2 (when the source was high and the transport time short) and Cassini observations in January 2000 (when the source appears to be low and the transport time long). Cassini observations between October 1999 and April 2000 reveal variations in composition (of the order of a factor of 2) over time scales of weeks-months.
Bagenal Fran
Delamere Peter
Steffl Andrew
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