Physics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2949g&link_type=abstract
Journal of Geophysical Research, vol. 85, June 1, 1980, p. 2949-2956.
Physics
60
Io, Jupiter Atmosphere, Plasma Interactions, Plasmasphere, Electric Current, Electric Fields, Field Aligned Currents, Inertia, Magnetohydrodynamic Waves, Mathematical Models, Planetary Magnetic Fields, Plasma Density, Rotating Plasmas, Sulfur Oxides, Thermal Energy, Toroidal Plasmas, Ultraviolet Radiation, Jupiter, Satellites, Io, Plasmas, Toruses, Mathematical Models, Alfven Waves, Pickup, Ions, Acceleration, Electric Fields, Density, Energy, Ultraviolet, Radiation, Magnetosphere, Observations, Sulfur, Voy
Scientific paper
A new model for the interaction of Io with the dense corotating plasma of the Io torus is described which involves pickup and Alfven waves carrying a field-aligned current. Pickup refers to the process whereby ions freshly created near Io are accelerated by the corotational electric field. It is shown that the pickup current is connected to a field-aligned current carried by an Alfven wave. The combination of currents allows for a self-consistent determination of the electric field in Io's vicinity. Using a simplified solution for the electric field, the total pickup rate, field-aligned current, enhancement of plasma density in Io's vicinity, thermal energy injected into the torus, UV radiation power, and inertial drag on the magnetosphere are calculated. All observations made by Voyager are compatible with an electron impact ionization mechanism and a neutral SO2 Io atmosphere with a density of 10 to the 9th/cu cm.
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