Corotation of the Kronian magnetosphere

Details Corotation of the Kronian magnetosphere Corotation of the Kronian magnetosphere

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3299e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3299-3303.

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27

Corotation, Earth Magnetosphere, Saturn Atmosphere, Ionospheric Conductivity, Jupiter Atmosphere, Planetary Ionospheres, Plasma Conductivity, Plasma Density, Plasma Temperature, Saturn Satellites, Upper Atmosphere, Voyager 2 Spacecraft, Saturn, Corotation, Magnetosphere, Plasma, Velocity, Satellites, Rhea, Dione, Orbits, Neutral Particles, Density, Temperature, Altitude, Ions, Atmosphere, Torque, Coupling, Conductivity, Comparisons, Ionosphere, Distance, Interactions, Rings, Mass Loading

Scientific paper

Observations of the radial variation of azimuthal plasma velocity in the inner part of the magnetosphere of Saturn show deviations from corotation occur as far in as L = 4. Major deviations from rigid corotation occur near the orbits of Rhea and Dione. The authors use Voyager-derived neutral and plasma density and temperature vs. altitude profiles in the upper atmosphere to verify that the atmospheric torque needed to drive corotation through neutral-ion coupling is available. They find that the observed azimuthal velocities and calculated Pedersen conductance are consistent with one another, but that the conductance is much less than previous values estimated for Saturn and Jupiter. The authors attribute the lower than anticipated conductivity to the large heliocentric distance, to the absence of an active satellite (such as Jovian Io) and to a possible role of ring material in depleting the ionosphere.

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