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What do global p-modes tell us about large scale solar flows?

Auteur

Chatterjee Piyali

Institution

NORDITA,

Theme

Convection, dynamo and flows
Auteur(s) supplémentaire(s)H. M. Antia
Institution(s) supplémentaire(s)Tata Institute of Fundamental Research, Mumbai

Abstract

It has been suggested that it may be possible to detect the existence of giant cells as well as subsurface meridional circulation based on frequency shifts of nearly degenerate p-modes coupled by these flow fields. We study these splitting coefficients using the previously applied technique of quasi-degenerate perturbation theory. We put limits on the magnitude of flow velocities
associated with giant cells by comparing the theoretical splitting coefficients with the observational data. Our investigation also reveals that it is not possible to detect frequency shifts due to purely poloidal flows like the meridional circulation in the observed global acoustic modes since the splitting coefficients are much smaller than the errors.
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