Fig. 28.

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(a) Growth rate versus frequency of the ζz-antisymmetric high-latitude mode with m = 1, for different values of the latitudinal entropy difference |Δθs|=s0, pole − s0, eq. The red star is for the case of a realistic latitudinal entropy gradient that depends on position, estimated according to Eq. (27). Realistic solar differential rotation is included. The background stratification is adiabatic (δ = 0) and the diffusivities are set to ν = κ = 1012 cm2 s−1. (b)–(f) Eigenfunctions of the longitudinal velocity vϕ at the surface (r = 0.985 R⊙) and at the central meridian for some selected Δsθ. The eigenfunctions are normalized so that the maximum flow amplitudes at the surface is vϕ = 10 m s−1.
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