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SUMMARY:Invited speaker: Evidence for recurrent asymmetries in the geomagn
 etic field on millennial timescales - Andreas Nilsson (Lund University)
DTSTART:20221201T141500Z
DTEND:20221201T150000Z
UID:TALK192140@talks.cam.ac.uk
DESCRIPTION:The strength of the geomagnetic field has decreased rapidly ov
 er the past two centuries\, coinciding with an increasing field asymmetry 
 due to the growth of the South Atlantic Anomaly. Here\, I will present a n
 ew geomagnetic field model based on archaeomagnetic and sedimentary palaeo
 magnetic data over the past 9000 years that shows quasiperiodic variations
  in the dipole moment that are linked to similar (recurrent) East-West fie
 ld asymmetries. I will also show new analyses of independent cosmogenic ra
 dionuclide records that both support these observations and provide new in
 formation on North-South asymmetries in the geomagnetic field.
LOCATION:Seminar Room 1\, Newton Institute
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