On the effect of convection on solar p modes

Abstract

We investigate the modulation of acoustic wave modes by convection. We consider a cavity that encloses a layer of convection rolls. The stratification due to gravity is taken into account. For the acoustic oscillation we use a harmonic expansion for the horizontal dependence, while a finite-difference scheme is employed in the vertical direction. We calculate the eigenfrequencies of the acoustic modes under adiabatic conditions, as functions of the velocity amplitude of the convection. The results confirm the frequency decreases found in earlier non-stratified models with only a vertical component of the convective velocity.