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Fig. C.18.


Parameter study (2D model) for different values of the turbulent viscosity νt, for a convection zone that is adiabatically stratified (δ = 0). The modes are those shown in Fig. 1. The frequencies of the m = 1 high-latitude mode and the m = 2 critical-latitude modes are sensitive to the choice of νt. The smaller values of νt (≤100 km2 s−1) give a better agreement with the observed frequencies (respectively −86.3 nHz and −73.4 nHz). The m = 3 equatorial Rossby modes is essentially insensitive to νt.

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