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SUMMARY:Force Balance in Dynamos Driven by Rotating Convection - David Hug
 hes (University of Leeds)
DTSTART:20220915T090000Z
DTEND:20220915T094500Z
UID:TALK177509@talks.cam.ac.uk
DESCRIPTION:One of the most improtant questions concerning dynamo action i
 s the nature of the resulting force balance. For example\, is a dynamo ess
 entially "VAC"\, with a balance between Viscous\, Archimedean (buoyancy) a
 nd Coriolis forces\, or\, at the other extreme\, "MAC"\, where the magneti
 c forces enter the balance\, but the viscous forces do not? Here we study 
 plane-layer dynamos driven by rotating convection in the absence of inerti
 a. This allows us to decompose the velocity into thermally- and magnetical
 ly-driven components. Through analysis of the soelnoidal projection of the
  forces -- which is tantamount to considering the vorticity equation\, but
  more tractable numerically -- we can consider the various forces in terms
  of the thermal and magnetic velocitites. We are able to identify "weak fi
 eld" solutions\, whereby the predominant balance is VAC\, and "strong fiel
 d" solutions\, in which the balance may be classified as "VMAC". We do not
  attain true MAC solutions.\nThis is joint work with Fausto Cattaneo of th
 e University of Chicago.
LOCATION:Seminar Room 1\, Newton Institute
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