Meridional cut (z = r cos θ and s = r sin θ) of dimensionless kinetic energy (left), potential energy associated with chemical (middle), and potential energy associated thermal stratification (right) of the forced mode for m = 2, E = 10⁻⁷, Pr = Sc = 1 with a spatial resolution of (N_r, N_ℓ) = (300, 301). The trajectories of characteristics are represented with white curves, while the surfaces at which they undergo reflections are shown with brown curves.