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SUMMARY:Staircasing and Bursting Events in Jovian Zonal Flows\, Couette-Ta
 ylor Flows\, Protoplanetary Disks\, and Their Consequences - Philip Marcus
  (University of California\, Berkeley)
DTSTART:20240116T090000Z
DTEND:20240116T100000Z
UID:TALK208462@talks.cam.ac.uk
DESCRIPTION:We examine the role of staircasing in creating and maintaining
  the Jovian east-west\, zone-belt system. Small-scale forcing\, along with
  the inverse cascade of kinetic energy and the anisotropic effects of Cori
 olis force can create zonal flows with north-spacings that are similar to 
 those observed on Jupiter. Those length scales are determined by the local
  Rossby deformation radius rather than the Rhines length\, which is more a
 ppropriate in the understanding of the differential energy spectrum of the
  zonal flows\, rather than determining the largest scales of the flows. Th
 e staircasing homogenizes the potential vorticity into steps\, and the flo
 ws undergo intermittent bursting when the number of steps in the staircase
  intermittently change to a larger or smaller number. In contrast\, the st
 aircasing observed in some Couette-Taylor flows\, which is a strongly forc
 ed and damped system\, is due to the homogenization of angular momentum. I
 n these flows\, the intermittent &nbsp\;bursting is not due to changes in 
 the number of steps\, but due to the cyclic\, but intermittent\, build-up 
 and release of energy in the flow. In protoplanetary disks\, the Keplerian
  velocity is modified into a staircase by the zombie vortex instability\, 
 which is due to the radial sequence of baroclinic critical layers in the d
 isk flow. Similar to the east-west\, zone-belt system\, the intermittent b
 ursting in the protoplanetary disk flows occurs when the number of steps i
 n the staircase intermittently changes to a larger or smaller number. Some
  consequences of the staircasing\, and bursting on vortices\, including th
 e Great&nbsp\;Red Spot of Jupiter\, will be presented.
LOCATION:Seminar Room 1\, Newton Institute
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