Wakes Magnitudes and Locations on the Edge of the Encke Gap

Details Wakes Magnitudes and Locations on the Edge of the Encke Gap Wakes Magnitudes and Locations on the Edge of the Encke Gap

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21346710w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #467.10; Bulletin of the American Astronomical Society, Vol. 41, p.416

Astronomy and Astrophysics

Astronomy

Scientific paper

Results from numerical, N-body simulations of the edge of the Encke Gap to explore Pan wake dynamics are presented. The simulations were run from the gap edge out to 260km beyond the gap. In these simulations, optical depth and particle size were varied. The simulations included particle collisions using a velocity dependent normal coefficient of restitution while transverse friction, spin, and particle self-gravity were ignored. The simulations were run for one synodic period, this gives enough time to observe the formation of the wakes and have them completely dissipate. Analyzing the wake peak dampening rates, it was found that the wakes damp out super-exponentially after they hit there maximum optical depth where particle streamlines should collide. The damping then slow to an exponential decay. Wake dampening further from the gap edge is always fit by and exponential decay. It was found that larger particle sizes lead to quicker wake dampening.
Wake peak locations were also analyzed by comparing where they occurred in the simulations with where they would be expected to occur in kinematic theory. It was found that simulated location matched up closely with theory up until the particles reach the point where streamlines should intersect. After this point the offset between the actual and expected locations increased with the simulated wake peaks lagging behind the locations expected from a kinematic description. The magnitude of this lag varies with particle properties and distance from the edge of the gap.

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