The problem of cooling the cold Io torus

Details The problem of cooling the cold Io torus The problem of cooling the cold Io torus

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.2001r&link_type=abstract

Journal of Geophysical Research, vol. 88, Mar. 1, 1983, p. 2001-2009.

Physics

19

Io, Ionic Diffusion, Plasma Dynamics, Plasma Temperature, Satellite Atmospheres, Cold Plasmas, Plasma Density, Steady State, Time Dependence, Toruses, Voyager Project, Jupiter, Satellites, Io, Torus, Temperature, Cooling, Calculations, Ions, Motion, Model, Transport, Radial Diffusion, Diffusion, Data, Convection, Thermal Effects, Density, Radiation, Time Dependence, Ionization

Scientific paper

Two models are developed for the transport of ions inward from Io's orbit, the first using the assumption that radial diffusion is the dominant transport mechanism while the second uses a combination of diffusive and convective transport. The models include thermal and number density transport, radiation, ionization and pickup of local neutrals, recombination, charge exchange, and Coulomb interactions. It is found that pure diffusive transport can account for the dramatic inward depletion of the torus only by invoking recombination or by postulating a massive increase in the production rate of torus ions sometime prior to the Voyager mission. Recombination is determined to be far too slow to be the cause of the observed density decrease inside of Io. The model combining convection and diffusion is shown to reasonably match the data, but only if a diffusion coefficient 100 times less than that derived from Pioneer observations is used. In addition, it is shown that the Pioneer derived diffusion rate combined with Voyager temperature and density measurements indicate a large nonradiative sink of energy in the inner torus.

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