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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2155
DTSTART:20110330T191500Z
DURATION:PT1H0M0S
DTSTAMP:20260420T134417Z
LAST-MODIFIED:20110328T190006Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Geomagnetic Secular Variation as a Window on the Dynamics of E
 arth's Core\, Special Plasma Seminar\, Andrew Jackson\, ETH Zurich
DESCRIPTION:One of the forefront questions of planetary geophysics is 
 to understand how magnetic fields can be spontaneously created by so-c
 alled dynamo action. Giant strides have been taken in recent years in 
 understanding the theory of convectively driven dynamos\; yet equally 
 important is the marriage between theory and observation. I will argue
  that we are on the cusp of a new level of understanding <br>
\nbrough
 t about by new methods for incorporating observations and theory\, aki
 n to those used in meteorology and oceanography. In 1950 Sir Edward Bu
 llard wrote an influential paper entitled "The westward drift of the E
 arth's magnetic field"\, with coauthors C Freedman\, H Gellman and J N
 ixon.  A comprehensive study of observations was tied together with th
 e then nascent dynamo theory to infer properties <br>
\nof the dynamic
 s of the core. Sixty years on\, we have a much enriched understanding 
 of the theory of  convectively driven dynamos\, and an even more compr
 ehensive database of observations stretching back several centuries. E
 qually important are the new satellite observations that provide globa
 l coverage with unprecedented accuracy over the last decade. In this t
 alk I will try to show how the interplay between theory and observatio
 n can lead to beter understanding of the dynamical regime in the core.
 <br>
URL:https://www.physics.wisc.edu/events/?id=2155
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