Energetic oxygen and sulfur in the Jovian magnetosphere

Details Energetic oxygen and sulfur in the Jovian magnetosphere Energetic oxygen and sulfur in the Jovian magnetosphere

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8906g&link_type=abstract

Journal of Geophysical Research, vol. 86, Oct. 1, 1981, p. 8906-8918.

Physics

29

Atmospheric Composition, Jupiter Atmosphere, Oxygen Ions, Planetary Magnetospheres, Sulfur, Diffusion Theory, Energy Spectra, Io, Plasma Diffusion, Voyager Project, Jupiter, Magnetosphere, Sulfur, Oxygen, Crs, Cosmic Ray Subsystem, Ions, Voyager 1, Voyager 2, Spectrum, Energy, Gradients, Phases, Acceleration, Density, Magnetic Moments, Satellites, Io, Plasma Torus, Particles, Let, Flux, Low Energy Telescope, Comparisons, Regions, Magnetic Fields, Data, Mathematical Models, Diffusion

Scientific paper

Measurements made in the Jovian magnetosphere by the cosmic ray subsystem on Voyager 1 and 2 are reported. Energy spectra of oxygen ions in the energy range 1-20 MeV/nuc between 5 and 20 Jovian radii are presented, and phase space densities are calculated. A steep positive radial gradient in the phase space density of the energetic oxygen ions is observed, indicating an inward diffusive flow. The upper limit on the rate at which oxygen ions with greater than 400 MeV/nuc-G diffuse across 10 Jovian radii is calculated to be 5 x 10 to the 21st ions per second, indicating that about 10 to the -7th of the ions from Io are accelerated to over 400 MeV/nuc-G and diffuse to 10 Jovian radii. Observations also suggest that oxygen and sulfur ions in the Io plasma torus diffuse radially outward, are nonadiabatically accelerated in a region outside 17 Jovian radii, and diffuse inward and outward from the accelerated region.

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