On the origin of irregular structure in Saturn's rings

Details On the origin of irregular structure in Saturn's rings On the origin of irregular structure in Saturn's rings

2002-11-07

arxiv.org/abs/astro-ph/0211149v1

Astron.J. 125 (2003) 894-901

Astronomy and Astrophysics

Astrophysics

21 pages, 1 figure, to be published in Astronomical Journal

Scientific paper

10.1086/345963

We suggest that the irregular structure in Saturn's B ring arises from the formation of shear-free ring-particle assemblies of up to ~100 km in radial extent. The characteristic scale of the irregular structure is set by the competition between tidal forces and the yield stress of these assemblies; the required tensile strength of ~10^5 dyn/cm^2 is consistent with the sticking forces observed in laboratory simulations of frosted ice particles. These assemblies could be the nonlinear outcome of a linear instability that occurs in a rotating fluid disk in which the shear stress is a decreasing function of the shear. We show that a simple model of an incompressible, non-Newtonian fluid in shear flow leads to the Cahn-Hilliard equation, which is widely used to model the formation of structure in binary alloys and other systems.

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