How does Saturn's moons influence the velocity dispersion in the A ring

Details How does Saturn's moons influence the velocity dispersion in the A ring How does Saturn's moons influence the velocity dispersion in the A ring

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1408s&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1408

Physics

Scientific paper

Saturn's moons perturb the rings due to their gravitational interactions with the ring material. Here, we present a model which accounts for the heating of the ring material due to these perturbations. The results emphasize the importance of the moon Prometheus for the velocity dispersion in the outer A ring of Saturn, which is probably 10 times higher than in the innermost A ring. An enhanced velocity dispersion would in turn lead to an enhanced production of smaller debris particles by knocking them off from larger parent bodies. This could lead to an increasing optical depth and brightness and limit the observability of the selfgravity wakes in the outer A ring. Furthermore, the velocity dispersion can be strongly enhanced in the vicinity of the major resonances (e.g. Janus 5:4) explaining the observed halos around them.

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