Centrifugally driven diffusion of Iogenic plasma

Details Centrifugally driven diffusion of Iogenic plasma Centrifugally driven diffusion of Iogenic plasma

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8471s&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8471-8479. Natural Sciences and Engineering Research Council of Ca

Physics

149

Diffusion Coefficient, Io, Plasma Diffusion, Satellite Atmospheres, Space Plasmas, Voyager 1 Spacecraft, Planetary Orbits, Plasma Density, Plasma Interactions, Steady State, Time Dependence, Jupiter, Satellites, Io, Plasmas, Diffusion, Voyager 1, Asymmetry, Hypotheses, Turbulence, Atmosphere, Density, Source Medium, Geometry, Eddy Effects, Mathematical Models

Scientific paper

The plasma distribution around Io as measured by Voyager 1 displays an asymmetric discontinuity at Io's orbit that has been suggested to be the signature of centrifugally driven interchange diffusion fed by plasma derived from Io. This hypothesis is explored further and found to be valid. The particular form for the diffusion coefficient appropriate to centrifugally driven turbulence is derived. The nonlinear character of this kind of diffusion is thereby made explicit. Solutions to the nonlinear, time-independent and linearized, time-dependent diffusion equations are given. These display a markedly conservative behavior. The nonlinear, steady state solutions are identical in form to the solutions of the previously studied equation of linear, atmospherically driven diffusion. The linearized, time-dependent solutions exhibit a negative feed-back quality that buffers the response of the density to changes in the source strength. Estimates of the source strength, the diffusion coefficient, and the signal propagation speed are also given.

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