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Charge exchange in the Io torus and exosphereCharge-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.
Document ID
19830036167
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Johnson, R. E.
(Naval Research Lab. Washington, DC, United States)
Strobel, D. F.
(U.S. Navy, Naval Research Laboratory, Washington DC, United States)
Date Acquired
August 11, 2013
Publication Date
December 1, 1982
Publication Information
Publication: Journal of Geophysical Research
Volume: 87
Subject Category
Lunar And Planetary Exploration
Accession Number
83A17385
Funding Number(s)
CONTRACT_GRANT: NAGW-186
Distribution Limits
Public
Copyright
Other

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