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SUMMARY:Invited speaker: Numerical modeling of inertial modes in the Sun -
  Yuto Bekki (Max Planck Institute for Solar System Research)
DTSTART:20221129T134500Z
DTEND:20221129T143000Z
UID:TALK192092@talks.cam.ac.uk
DESCRIPTION:Recently\, various kinds of inertial modes have been detected 
 on the Sun. The restoring force of these inertial modes is the Coriolis fo
 rce\, and thus they have completely different mode properties from acousti
 c (p) modes. It is expected that the observations of solar inertial modes 
 can potentially be used as an alternative tool to probe the interior of th
 e Sun\, especially to constrain some unknown parameters (such as turbulent
  viscosity and superadiabaticity) that p-modes are insensitive to.\nIn thi
 s talk\, we use both linear and fully-nonlinear models of the solar convec
 tion zone to study the properties of solar inertial modes. We report a dis
 covery of mixed modes between the equatorial Rossby modes and columnar con
 vective (thermal Rossby) modes. The observed amplitudes of the equatorial 
 Rossby modes can be explained by stochastic excitation due to turbulent co
 nvection. We also find that the observations of the high-latitude modes ca
 n only be reproduced when the latitudinal entropy gradient exists. This re
 sult is regarded as an observational evidence of the thermal wind balance 
 in the Sun's convection zone. Possible effects of the magnetic field will 
 also be discussed.
LOCATION:Seminar Room 1\, Newton Institute
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