Saturn's rings - Voyager 1 radio occultation experiment results

Physics

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Microwave Scattering, Particle Size Distribution, Radio Occultation, Saturn Rings, Voyager 1 Spacecraft, Microwave Attenuation, Opacity, Particle Density (Concentration), Particle Trajectories, Planetary Rotation, Polar Coordinates, Scattering Functions

Scientific paper

The Voyager 1 encounter with Saturn in 1980 included the first radio occultation measurements of the ring system. Opacity of and scattering by Saturn's rings were measured at 3.6- and 13-cm wavelengths using transmissions from the spacecraft to the earth. Detailed models of ring structure have been derived from these data at radial resolutions as small as 1 km, depending on the radio opacity of the region probed. Inverse power-law-type distributions of ring particle sizes with indices of about 3 and upper size cutoffs near 5 m are in good agreement with the data, but parameters vary throughout the rings. Occultation measurements have also provided information on ring dynamics and have led to a more precise definition of Saturn's pole vector.

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