Real (top) and imaginary (bottom) parts of even Hough functions (n even) associated with a quadrupolar tidal perturbation (m = 2) and defined by with ν =1 (ordinary/gravity modes) and various positive values of γ = σR∕σ. From left to right, γ = 0 (non-frictional regime), γ = 0.1 (weakly frictional regime), γ = 1 and γ = 10 (stronglyfrictional regime). Hough functions are plotted as functions of the latitude δ (degrees).
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