Radial diffusion and losses of energetic protons in the 5 to 12 R(S) region of Saturn's magnetosphere

Details Radial diffusion and losses of energetic protons in the 5 to 12 R(S) region of Saturn's magnetosphere Radial diffusion and losses of energetic protons in the 5 to 12 R(S) region of Saturn's magnetosphere

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.8721h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 1, 1989, p. 8721-8730.

Physics

15

Energetic Particles, Particle Diffusion, Planetary Magnetospheres, Proton Energy, Saturn Atmosphere, Atmospheric Diffusion, Dione, Particle Precipitation, Saturn Rings, Saturn, Magnetosphere, Diffusion, Protons, Density, Pioneer 11 Mission, Spacecraft Observations, Satellites, Absorption, Rings, E Ring, Models, Dione, Rhea, Scattering, Precipitation, Calculations, Charge Exchange, Parameters

Scientific paper

Phase space density profiles for nearly equatorial mirroring energetic protons, derived from Pioneer 11 measurements during the 1979 Saturn encounter, were analyzed using solutions of the time-averaged radial diffusion equation in a dipolar planetary magnetic field. Then, several loss models were considered, ranging from a model that takes into account satellite absorption only to the one that accounts for satellite plus ring-E absorption plus added distributed losses, and the corresponding form of the time-averaged radial diffusion coefficient was determined for each case by a minimum-variance fit to the data-derived phase space densiy profiles. The model comparisons clearly indicated the need for distributed losses, in addition to satellite absorption, in order to explain the smooth decline of the experimental energetic proton phase space density profiles in the 5-12-Saturn radius region of Saturn's magnetosphere.

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