Physics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....8710385j&link_type=abstract
Journal of Geophysical Research, vol. 87, Dec. 1, 1982, p. 10385-10393.
Physics
40
Charge Exchange, Exosphere, Io, Ion Atom Interactions, Satellite Atmospheres, Toroidal Plasmas, Collisional Plasmas, Electron Energy, Plasma-Particle Interactions, Resonance Charge Exchange, Sodium, Sulfur
Scientific paper
Charge-exchange cross sections and their velocity dependence have been estimated for the most important reactions in the Io torus and exosphere. The methods used for calculating the cross sections are given and discussed in some detail. For symmetric-resonant single and double charge exchange, the cross sections are slowly varying functions of velocity. For inelastic charge-exchange collisions, the transition probabilities into a given final state can depend critically on velocity. Models are described which can be used to estimate both the most rapid charge-exchange processes and those states which play an important role. Calculated cross sections are used to obtain reaction rates as a function of radial position, demonstrating the importance of charge exchange in the inner torus. Charge-exchange reactions of torus ions with molecular species in Io's exosphere may yield a net supply of neutrals and plasma to the torus.
Johnson Robert E.
Strobel Darrell F.
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