NDLI: Prometheus Induced Vorticity in Saturn’s F Ring

Content Provider	Springer Nature Link
Author	Sutton, Phil J. Kusmartsev, Feo V.
Copyright Year	2016
Abstract	Saturn’s rings are known to show remarkable real time variability in their structure. Many of which can be associated to interactions with nearby moons and moonlets. Possibly the most interesting and dynamic place in the rings, probably in the whole Solar System, is the F ring. A highly disrupted ring with large asymmetries both radially and azimuthally. Numerically non-zero components to the curl of the velocity vector field (vorticity) in the perturbed area of the F ring post encounter are witnessed, significantly above the background vorticity. Within the perturbed area rich distributions of local rotations is seen located in and around the channel edges. The gravitational scattering of ring particles during the encounter causes a significant elevated curl of the vector field above the background F ring vorticity for the first 1–3 orbital periods post encounter. After 3 orbital periods vorticity reverts quite quickly to near background levels. This new found dynamical vortex life of the ring will be of great interest to planet and planetesimals in proto-planetary disks where vortices and turbulence are suspected of having a significant role in their formation and migrations. Additionally, it is found that the immediate channel edges created by the close passage of Prometheus actually show high radial dispersions in the order ~20–50 cm/s, up to a maximum of 1 m/s. This is much greater than the value required by Toomre for a disk to be unstable to the growth of axisymmetric oscillations. However, an area a few hundred km away from the edge shows a more promising location for the growth of coherent objects.
Starting Page	117
Ending Page	131
Page Count	15
File Format	PDF
ISSN	01679295
Journal	Earth, Moon, and Planets
Volume Number	118
Issue Number	2-3
e-ISSN	15730794
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-09-08
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Planets and satellites: formation Planets and satellites: rings Methods: numerical Turbulence Planet–disc interactions Protoplanetary discs Astronomy, Observations and Techniques Planetology Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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