Helioseismology Techniques explored Through 3D Global Modeling

Abstract:

In order to better understand the data observed by techniques in helioseismology, we implement a forward modeling approach using a newly developed 3D global numerical solver of the linearized compressible Euler equations (3D GLASS) on a fully spherical mesh (0≤φ≤2π, 0≤θ≤π, 0≤r≤R). This algorithm simulates acoustic velocity perturbations throughout the solar interior, computing oscillations over a constant solar profile generated by the Solar Model S. We simulate various 3D regimes of background velocities in order to test theoretical models of meridional circulation and compare them to observational data generated by helioseismology. We demonstrate the efficacy of our model and its techniques for the pseudo-spectral computation of dyad tensor terms by showing effects of frequency splitting due to azimuthal velocities in a non-rotating reference frame as well as applications of local helioseismology to detect simple models of meridional circulation.