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SUMMARY:Making Waves in the Core of the Earth - Oliver Bardsley. Universit
 y of Cambridge (CUED)
DTSTART:20170526T120000Z
DTEND:20170526T130000Z
UID:TALK72177@talks.cam.ac.uk
CONTACT:Garazi Gomez-de-Segura
DESCRIPTION:I make the claim that the outer core of the Earth\, a rapidly-
 rotating\, electrically-conducting ocean vigorously stirred by convective 
 upwellings\, is a breeding ground for a diverse zoo of wave motions. These
  are highly dispersive (since propagation velocity depends on wavelength)\
 , anisotropic (due to the rotation axis and local magnetic field direction
 )\, caustical (or “self-focussing”)\, heterogeneous (due to a spatiall
 y-varying field)\, dissipative (owing to the field’s diffusive nature)\,
  and non-linear (necessarily\, if they are to alter field topology). I add
 ress all but one of these peculiarities\, unearthing some interesting phen
 omena along the way\, and perhaps opening a small window onto planetary co
 re dynamics – specifically the mechanisms which may encourage dynamo act
 ion.
LOCATION:JDB Seminar Room\, CUED
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