Radial diffusion in Io's torus - Some implications from Voyager I

Details Radial diffusion in Io's torus - Some implications from Voyager I Radial diffusion in Io's torus - Some implications from Voyager I

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7...33f&link_type=abstract

Geophysical Research Letters, vol. 7, Jan. 1980, p. 33-35.

Astronomy and Astrophysics

Astronomy

2

Charged Particles, Cosmic Plasma, Io, Particle Diffusion, Plasma Diffusion, Radial Distribution, Density Distribution, Diffusion Coefficient, Jupiter Atmosphere, Magnetospheric Electron Density, Magnetospheric Ion Density, Radio Astronomy, Spaceborne Experiments, Toruses, Voyager Project, Jupiter, Satellites, Io, Torus, Diffusion, Voyager 1, Ions, Charged Particles, Ultraviolet, Density, Gradients, Electrons, Sulfur, Atmosphere, Plasmas, Flux Tube, Models, Intensity, Planetary Radio Astronomy Experiment, Ul

Scientific paper

Data from several Voyager 1 experiments are used to determine the magnitude and L dependence of the radial diffusion coefficient for low-energy charged particles outside of Io's orbit under steady-state conditions. The extreme ultraviolet observations near 685A are inverted to produce an ion density profile for L greater than 6. This normalized ion profile as well as the (equatorial) electron density profile estimated from the planetary radio astronomy (PRA) observations falls off as L to the -5th. Such a density gradient would make possible centrifugally driven cross-L diffusion outside of Io's orbit without ruling out the presence of an atmospherically driven mechanism. A lower limit for the radial diffusion coefficient DLL is 1.5 x 10 to the -10th L to the 5th (Jupiter radii squared per sec), yielding a characteristic diffusion time from 6RJ to 7RJ of less than 10 days, much shorter than previously anticipated. Steady-state diffusion is not a good assumption inside of Io's orbit, where the particle densities decrease sharply from 6 Jupiter radii to 5 Jupiter radii; the diffusion time in that region is probably longer than outside of Io's orbit.

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