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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Invited speaker: Numerical modeling of inertial mo
 des in the Sun - Yuto Bekki (Max Planck Institute 
 for Solar System Research)
DTSTART;TZID=Europe/London:20221129T134500
DTEND;TZID=Europe/London:20221129T143000
UID:TALK192092AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/192092
DESCRIPTION:Recently\, various kinds of inertial modes have be
 en detected on the Sun. The restoring force of the
 se inertial modes is the Coriolis force\, and thus
  they have completely different mode properties fr
 om acoustic (p) modes. It is expected that the obs
 ervations of solar inertial modes can potentially 
 be used as an alternative tool to probe the interi
 or of the Sun\, especially to constrain some unkno
 wn parameters (such as turbulent viscosity and sup
 eradiabaticity) that p-modes are insensitive to.\n
 In this talk\, we use both linear and fully-nonlin
 ear models of the solar convection zone to study t
 he properties of solar inertial modes. We report a
  discovery of mixed modes between the equatorial R
 ossby modes and columnar convective (thermal Rossb
 y) modes. The observed amplitudes of the equatoria
 l Rossby modes can be explained by stochastic exci
 tation due to turbulent convection. We also find t
 hat the observations of the high-latitude modes ca
 n only be reproduced when the latitudinal entropy 
 gradient exists. This result is regarded as an obs
 ervational evidence of the thermal wind balance in
  the Sun's convection zone. Possible effects of th
 e magnetic field will also be discussed.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:
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