Helioseismic Signatures of One- and Two-Cell Meridional Circulation

摘要: Using a 3D global solver of the linearized Euler equations, we model acoustic oscillations over background velocity flow fields single-cell meridional circulation with deep and shallow return flows as well double-cell profile. The velocities are generated using mean-field hydrodynamic dynamo -- moving through regimes minimal parameter changes; counter-rotation near base tachocline is induced by sign inversion non-diffusive action turbulent Reynolds stresses ($\Lambda$-effect) due to radial inhomogeneity Coriolis number. By mimicking stochastic excitation resonant modes in convective interior, simulate realization noise present solar observations. deep-focusing analyze differences travel-time signatures between three regimes, comparing observations, show that current helioseismology techniques may offer important insights about location flow, however, it not be possible definitively distinguish profiles or circulation.