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SUMMARY:Kirk Lecture:  Earth's Magnetic Field: Random Reversals\, Stochast
 ic Models\, Physical Realities - Catherine Constable (University of Califo
 rnia\, San Diego)
DTSTART:20221117T160000Z
DTEND:20221117T170000Z
UID:TALK192356@talks.cam.ac.uk
DESCRIPTION:Paleomagnetic studies reveal that Earth&rsquo\;s magnetic fiel
 d is sustained by a dynamo in its liquid outer core and is intimately link
 ed to the history and thermal evolution of our planet. The field has rever
 sed polarity many times: these apparently random reversals occur when its 
 overall strength decays\, and there are departures from the usual structur
 e\, which at Earth's surface is to first order that of an axially aligned 
 magnetic dipole. We know surprisingly little about the origin of these rad
 ical events\, which are the most extreme elements of a continuum of magnet
 ic field changes that also includes geomagnetic excursions\, rapid changes
  in field strength\, and other less spectacular features collectively know
 n as paleosecular variation. Stochastic models based on paleofield observa
 tions are developed to describe field changes on all timescales and provid
 e a bridge to enhance physical and mathematical understanding for dynamo m
 odelers engaged in theoretical work and in direct numerical simulations. T
 here is scope for significant future advances in this arena.
LOCATION:Seminar Room 1\, Newton Institute
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