Mathematics – Logic
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..442m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, May 1986, p. 442, 443.
Mathematics
Logic
3
Planetary Structure, Uranus Rings, Neptune (Planet), Saturn Rings, Uranus, Rings, Ringlets, Shepherd Satellites, Spacecraft Observations, Voyager 2, Motion, Occultations, Radio Methods, Composition, Size, Particles, Collisions, Viscosity, Circulation, Hypotheses
Scientific paper
In light of the Voyager 2 mission, the ringlets of Uranus seem unlikely to be accompanied by the swarm of 10 to 18 'shepherding' satellites generally supposed. Consequently, coherent motion (i.e., bulk circulation) in the ringlets again deserves serious consideration. Moreover, the radio occultation data show the rings to be composed of larger boulders, but few of the small particles one would expect if these boulders bumped and ground against one another, as they would have to if the motions were incoherent. Recent evidence that Neptune's ringlets may be incomplete arcs further points in this direction. Dense ('liquid') rings have been proposed by Borderies, Goldreich and Tremaine (1983, 1985). It is pointed out that such rings would be essentially viscosity-free, if executing coherent circulation, and hence would endure for geologically long time scales.
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