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SUMMARY:Observational Keynote 1: Geomagnetic Field Observations - Knowns a
 nd Other Things - Catherine Constable (University of California\, San Dieg
 o)
DTSTART:20221128T100000Z
DTEND:20221128T110000Z
UID:TALK192062@talks.cam.ac.uk
DESCRIPTION:This presentation will provide an overview of observations of 
 the geomagnetic field\, highlighting those that could be considered suffic
 iently reliable to inform what might be considered Earth-like numerical dy
 namo simulation.&nbsp\; Modern high-quality direct geomagnetic observation
 s have contributed greatly to our knowledge of Earth&rsquo\;s field and sh
 ort-term secular variation. &nbsp\;However\, they only touch a tiny fracti
 on (400 of about 4 billion years) of the full spectrum of field behavior\,
  providing some illusion of stability\, while the longer view is revealed 
 by paleomagnetic studies. &nbsp\;With appropriate chronological constraint
 s paleomagnetic data provide information about the field&rsquo\;s longevit
 y\, the rates of occurrence and some broad inferences concerning polarity 
 reversals\, excursions\, rapid changes in field strength\, and other less 
 spectacular features collectively known as paleosecular variation. The pas
 t three decades have seen considerable effort devoted to developing both s
 tochastic and deterministic descriptions of paleofield observations and so
 me attempts to reconcile the two approaches will be described.
LOCATION:Seminar Room 1\, Newton Institute
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