Speaker
Description
First Name: Allan Sacha
Last Name: Brun
Affiliation: Dept. of Astrophysics, CEA Paris-Saclay
All Authors: A.S. Brun, Q. Noraz, A. Strugarek, G. Doebele
Abstract: Helioseismic inversions of the solar convective power distribution confirms that there is a disagreement on the amplitude of the large scale convection motions between different observational techniques as well as with numerical simulations of global solar convection. This tension is known as the solar Convective Conundrum. In this talk, we will present a recent study based on high resolution numerical simulations of global solar convection with the ASH code, that characterizes how the power is distributed among the convection scales depending on input parameters. By following a theory path in parameter space that respects key identified force balances via a control of the Nusselt number at fixed Rossby but increasing Reynolds number, we are able to build a global highly turbulent model of the solar convection that is in better agreement with the various observational constraints (large scale convective power, polar Rossby mode, superadiabaticity degree). We discuss the properties of this new solar model, the dynamics of the polar zone and the way forward with a new advanced code named Dyablo-Whole Sun that allows to model also the solar acoustic oscillations.