Ion cyclotron waves in the Io plasma torus - Polarization reversal of whistler mode noise

Details Ion cyclotron waves in the Io plasma torus - Polarization reversal of whistler mode noise Ion cyclotron waves in the Io plasma torus - Polarization reversal of whistler mode noise

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..587g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, July 1983, p. 587-590.

Physics

16

Io, Ion Cyclotron Radiation, Jupiter Atmosphere, Polarization (Waves), Whistlers, Auroras, Extreme Ultraviolet Radiation, Ion Distribution, Particle Precipitation, Toroidal Plasmas, Voyager 1 Spacecraft, Jupiter, Ions, Waves, Satellites, Io, Plasma, Torus, Polarization, Whistlers, Intensity, Magnetosphere, Voyager 1, Diffusion, Resonance, Precipitation, Ultraviolet, Wavelengths, Auroras, Emissions

Scientific paper

Because of the presence of multiple ion species in the Io plasma torus, whistler mode noise can be converted to ion cyclotron waves via a polarization reversal process at the local crossover frequency. Using whistler mode intensity measurements in the Jovian magnetosphere from Voyager 1, the pitch-angle diffusion rates that would occur if the noise is converted to ion cyclotron waves is estimated. Typical pitch-angle diffusion coefficients range from 0.000001/sec for protons resonating near the equator to 0.0001/sec for 10-keV O(+) ions resonating at high latitudes. Although complete bounce averaged diffusion coefficients have not yet been computed, preliminary estimates indicate that the energetic ion precipitation caused by these waves may be able to account for the EUV auroral emissions at the foot of the torus field lines.

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