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SUMMARY:Controversial issues concerning the origin of the Earth’s magnet
 ic field - Professor Emmanuel Dormy\, ENS Paris
DTSTART:20200313T130000Z
DTEND:20200313T140000Z
UID:TALK138421@talks.cam.ac.uk
CONTACT:Connor O'Pray
DESCRIPTION:The origin of the Earth’s magnetic field is an apparently si
 mple\, yet challenging problem. In terms of mathematical models\, dynamo a
 ction in a rotating spherical domain is the -now well established- model t
 o account for the magnetic field of planets and stars. Whereas the relevan
 t equations are easily written\, the parameters regime relevant to the Ear
 th’s core is so extreme that a numerical solution with these parameters 
 is out of reach of today’s largest computers. This raises the daunting q
 uestion of the relevance of today’s state-of-the-art numerical models to
  the mechanisms at work within our planet. Several issues\, on which resea
 rchers often disagree\, naturally follow: What can we learn by comparing m
 odels with observations? Can we test numerical models against theoretical 
 results? Can the relevant forces balance in the Earth’s core be approach
 ed in numerical models? Could the unresolved small scale and rapidly varyi
 ng flow be important? In this talk\, I will try to place the emphasis on o
 pen and controversial issues. 
LOCATION:LT6\, Baker Building\, CUED
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