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SUMMARY:Towards asymptotic models and minimal seeds for the geodynamo - Pr
 ofessor Steven Tobias\, University of Leeds
DTSTART:20250124T160000Z
DTEND:20250124T170000Z
UID:TALK226189@talks.cam.ac.uk
CONTACT:Professor Grae Worster
DESCRIPTION:The mechanism for generation of magnetic field in Earth’s co
 re (and the interior of other planets) is poorly understood. The wide rang
 e of temporal scales on which dynamics occurs is vast (with the viscous ti
 mescale being many orders of magnitude  longer than a rotational period. F
 or this reason\, computational models are difficult to push into geophysic
 ally meaningful regimes (though much can be learned). In this talk I shall
  describe two approaches to understanding these dynamos. The first utilise
 s the construction of asymptotic models in a plane layer\, based on the an
 isotropy of flows that naturally occur in rapidly rotating system. The sec
 ond uses techniques from wall-bounded shear flows to determine “minimal 
 seeds” of a magnetic field for dynamo action in such rapidly rotating sy
 stems.
LOCATION:MR2
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