Top: power spectrum computed at the solar surface. The blue crosses indicate the position of the p₁–p₈ modes reported by Korzennik et al. (2013), while the blue dashed line shows the observed f-mode ridge which is missing in this simulation owing to the lack of a gravitational term. Bottom: comparisons of the simulated power spectrum (red) and HMI data (black) at ℓ = 500. The small misalignment of the simulated ridges from the observations are due to imperfect modeling of surface layers in Model S (i.e., surface effects, Rosenthal et al. 1999).