What can 3-D global simulations teach us about the solar turbulent convection zone, differential rotation and meridional circulation?

Astronomy and Astrophysics – Astrophysics

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Scientific paper

Understanding the complex solar surface convection zone and associated mean flows is a great challenge of modern astrophysics. Thanks to helioseismology and powerful parallel supercomputers, we are starting to make significant progress in developing a coherent picture of the solar internal dynamics. We here report on the recent advances made in modelling in three dimensions in a spherical shell, with the ASH code, the solar turbulent convection zone and its nonlinear and thermal coupling with the boundary layer called the tachocline. We find that baroclinic balance (i.e. thermal wind) and Reynolds stresses are key players in establishing the observed solar differential rotation. The associated meridional circulation is found to possess a multi-cell structure both in radius and latitude. Such a profile, if confirmed by deep helioseismic inversions, could significantly impact our current understanding of the solar global dynamo.

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