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SUMMARY:Dynamics of the Earth's Inner Core Tangent Cylinder - Rainer Holle
 rbach\, University of Leeds
DTSTART:20110307T160000Z
DTEND:20110307T170000Z
UID:TALK29191@talks.cam.ac.uk
CONTACT:Sijme-Jan Paardekooper
DESCRIPTION:Fluid motions in the Earth's outer core are dominated by the s
 o-called magnetostrophic balance\, in which Coriolis\, pressure-gradient\,
  Lorentz and buoyancy forces are all important\, but inertial and viscous 
 effects are extremely small. I will show that in general this balance lead
 s to singularities on the tangent cylinder\, the cylinder parallel to the 
 rotation axis and touching the inner core. These singularities can be avoi
 ded either by restoring viscous effects\, however small\, or by having the
  Lorentz force adjust to satisfy a hierarchy of constraints on the tangent
  cylinder. We suggest that most of the time the internal magnetic field wi
 ll indeed adjust to satisfy at least the leading one or two of these const
 raints\, and that occasional breakdowns in satisfying these constraints ma
 y be a mechanism for triggering torsional oscillations emanating from the 
 tangent cylinder\, as indicated by recent observational work.
LOCATION:MR14\, DAMTP\, Pav. F
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