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This is a 2D Gaussian random field with a $1/k^2$ spectrum and linear dispersion $\omega \propto k$. I clip the field to positive values and square root it to give an edge to the "clouds". n = 256; k2 = Outer[Plus, #, #] &[RotateRight[N@Range[-n, n - 1, 2]/n, n/2]^2]; spectrum = With[{d := RandomReal[NormalDistribution[], {n, n}]}, (1/n) (d + I ...

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