Physics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..107l&link_type=abstract
Geophysical Research Letters, vol. 8, Jan. 1981, p. 107-110.
Physics
6
Atmospheric Models, Exosphere, Gas Giant Planets, Planetary Atmospheres, Electron Density Profiles, Jupiter Atmosphere, Saturn Atmosphere, Saturn Rings, Uranus Atmosphere, Planets, Rings, Models, Exosphere, Data, Jupiter, Saturn, Uranus, Plasmas, Density, Altitude, Dipole, Charged Particles, Analysis, Ionosphere, Plasmasphere, Trajectories, Pioneer 11, Radio Occultation, Scattering, Temperatures, Source Medium, Sputtering
Scientific paper
The theory of rotating ion exospheres in dipolar magnetic field geometries is used to predict certain effects of the rings on the inner plasmaspheres of the ringed planets Jupiter, Saturn, and Uranus. The analysis here assumes a purely ionospheric source. It is found that if rings affect only the trapped plasma, the cold plasma density at Saturn will be either reduced or increased by a factor of approximately 2 at L = 1.65, depending on whether the ring populates or empties the trapped trajectories. It is found that if all cold plasma particles on trapped orbits are absorbed and the rings are not a source of plasma, this simple exospheric theory can explain the ionospheric density profile inferred from the Pioneer 11 Saturn radio occultation experiment, in which a localized peak in the profile was observed on field lines threading the Guerin division between the C and D rings.
Luhmann Janet G.
Walker Ray J.
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