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SUMMARY: Strong- field dynamo models for the Geodynamo - Emmanuel Dormy (E
 NS Paris)
DTSTART:20170206T160000Z
DTEND:20170206T170000Z
UID:TALK69581@talks.cam.ac.uk
CONTACT:Robert Teed
DESCRIPTION:Numerical models of the geodynamo are usually classified into 
 two categories: dipolar\nmodes\, observed when the inertial term is small 
 enough\; and multipolar fluctuating\ndynamos\, for stronger forcing. I hav
 e recently shown that a third dynamo branch corresponding\nto a dominant f
 orce balance between the Coriolis force and the Lorentz force can\nbe prod
 uced numerically. This regime corresponds to a strong-dipolar branch which
  appears to approach\, in a numerically affordable regime\, the magnetostr
 ophic limit relevant to the dynamics of the Earth's core.\nI will discuss 
 the relevance to this strong-dipolar state to Geodynamo modelling.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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