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SUMMARY:Contributed talk: Observational constraints on the Sun’s global 
 dynamo - Robert Cameron (Max Planck Institute for Solar System Research)
DTSTART:20221201T134500Z
DTEND:20221201T141500Z
UID:TALK192137@talks.cam.ac.uk
DESCRIPTION:I will present observations of the axisymmetric toroidal and p
 oloidal magnetic fields observed at the solar surface. The toroidal compon
 ent is due to flux emergence\, and indicates that approximately 10^23 Mx o
 f toroidal flux is lost from each hemisphere during the course of a solar 
 cycle. A similar amount is generated through the winding up of the polar f
 ields. Stokes Theorem tells us that the polar fields themselves are the ac
 cumulation of magnetic flux which crosses the equator in the photosphere\,
  where we now have 40 years of detailed observations.\nThese observations 
 allow us to constrain both solar cycle variability and indicate the import
 ance of Joy&rsquo\;s law.
LOCATION:Seminar Room 1\, Newton Institute
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