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SUMMARY:Powering Stellar Magnetism: Energy Transfers in Convective Dynamo 
 of Sun-like Stars - Allan Sacha Brun - CEA Paris-Saclay
DTSTART:20210607T130000Z
DTEND:20210607T140000Z
UID:TALK157969@talks.cam.ac.uk
CONTACT:Cleo Loi
DESCRIPTION:We present recent advances made to understand the origin of st
 ellar magnetism thanks to an extensive 3D MHD study of convective dynamo o
 f solar-type stars. We aim at characterising the detailed energy transfers
  occurring in\nthese model stars and the type of dynamos realised (statist
 ically steady\, cyclic on either long or short time scales)\, depending on
  the stellar global parameters considered. We confirm that the Rossby numb
 er is a good proxy to identify key transitions for the different dynamical
  behaviours found in our study. We also propose various scaling laws for t
 he large scale field\, magnetic flux and surface differential rotation tha
 t are qualitatively in good agreement with observations of stellar magneti
 sm. We also quantify the amount of stellar energy converted into magnetic 
 energy finding that there is plenty of energy (up to 3% of the stellar lum
 inosity) made available to power surface eruptive events. We conclude by d
 iscussing  the so-called spot-dynamo paradox\, e.g.are starspots playing o
 r not a key role in the operation of stellar cyclic dynamos?
LOCATION:Online
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