Fig. 1

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Solutions of the 1D SFT equation with a bipolar source placed at λ0 = +15° latitude at time t = 0. Units of the model parameters shown on top of the rows are m/s, km2/s and year, respectively. The meridional flow profile is given by equation (9). Dashed blue lines in the left-hand plots mark the asymptotic solutions D = δD (top) and D = δDexp(−t/τ) (bottom).

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