Plasma transport in the Io torus - The importance of microscopic diffusion

Details Plasma transport in the Io torus - The importance of microscopic diffusion Plasma transport in the Io torus - The importance of microscopic diffusion

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..119y&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 119-122.

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2

Io, Mass Transfer, Plasma Diffusion, Plasma Dynamics, Toroidal Plasmas, Turbulent Diffusion, Mass Distribution, Plasma Waves, Voyager 1 Spacecraft, Jupiter, Plasma Torus, Transport, Diffusion, Mass, Distribution, Models, Distance, Eddy Diffusion, Flux Tube, Numerical Methods, Density Gradient, Mixing, Equilibrium, Hypotheses

Scientific paper

This paper considers the question of whether the distribution of mass in the Io plasma torus is consistent with the concept of interchange eddy transport. Specifically, the flux tube content exhibits a gradual decrease with increasing radial distance from the source near Io without any evidence for substantial density irregularity associated with the plasma source or loss. Using a simple one-dimensional numerical model to simulate macroscopic interchange eddy transport, it is demonstrated that this smooth equilibrium distribution of mass can occur but only with the inclusion of a minimal level of small scale microscopic mixing at a rate approaching Bohm diffusion. Otherwise, the system exhibits a chaotic appearance which never approaches an equilibrium distribution. Various physical mechanisms for the microscopic diffusion process which is required to provide a sufficiently rapid mixing of material between the macroscopic eddies are discussed.

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