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SUMMARY:Invited speaker: Solar Tachocline Confinement by a Dynamo with Dee
 p Extent - Loren Matilsky (University of California\, Santa Cruz)
DTSTART:20221202T090000Z
DTEND:20221202T094500Z
UID:TALK192152@talks.cam.ac.uk
DESCRIPTION:In the solar tachocline at the base of the convection zone\, s
 trong latitudinal differential rotation transitions to nearly solid-body r
 otation in the underlying radiative interior. The observed thinness of the
  tachocline remains largely unexplained\, given that diffusive processes a
 cting over the Sun&rsquo\;s main-sequence lifetime are expected to have im
 printed the latitudinal differential rotation deep into the radiative inte
 rior. Here\,&nbsp\;we present a global MHD simulation in which a non-axisy
 mmetric\, cycling dynamo forces the radiative interior into solid-body rot
 ation. The magnetic torque counters viscous tachocline spread by a process
  similar to Ferraro&rsquo\;s law of isorotation\, as applied to a longitud
 inally and temporally varying magnetic field. Furthermore\, there is dynam
 o-amplified field even below the convective overshoot layer\, driven there
  by strong horizontal motions that are in part due to equatorially confine
 d Rossby waves. We discuss this simulation in light of the proposed fast m
 agnetic tachocline confinement scenario and the depth to which the solar d
 ynamo extends.
LOCATION:Seminar Room 1\, Newton Institute
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