Time dependent plasma injection by Io

Details Time dependent plasma injection by Io Time dependent plasma injection by Io

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7...37r&link_type=abstract

Geophysical Research Letters, vol. 7, Jan. 1980, p. 37-40.

Physics

10

Cosmic Plasma, Heavy Ions, Io, Ion Injection, Plasma Diffusion, Time Dependence, Diffusion Coefficient, Earth Magnetosphere, Jupiter Atmosphere, Plasma Spectra, Spaceborne Experiments, Voyager Project, Jupiter, Satellites, Io, Plasmas, Time Dependency, Injection, Models, Flux Tube, Diffusion, Voyager 1, Parameters, Temperatures, Data, Analysis, Density, Orbits, Transport, Ions, Gradients

Scientific paper

A two parameter model of time-dependent, flux-tube interchange diffusion is fit to the Voyager 1 plasma data obtained in the Io plasma disk. The interpretation of the parameters required to achieve the fit is that plasma injection increased suddenly and substantially (by more than an order of magnitude) at some time prior to the arrival of Voyager 1 (between 1 and 100 days prior). The injection rate was about 2 x 10 to the (29 plus or minus 1) power ion/sec. At this rate, the centrifugally driven interchange instability dominated outward diffusion, causing the outward diffusion rate to be about a factor of 50 greater than the inward diffusion rate. The material diffusing inward had time to cool by radiation, possibly accounting for the observed temperature drop inside the orbit of Io.

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