a) Radial component of the velocity on the r − φ plane through the centre of the bipole at t = 11.6 τ_Alf. b) Radial component of the velocity on the θ − φ plane at r = 1.07 R_⊙ at the same time with superimposed contours of the radial component of the magnetic field (black lines, dashed lines for negative values and solid lines for positive values) and the projection of the horizontal velocity field onto the same θ − φ plane (green arrows, typical velocity is 2 × 10⁶ cm/s and minimum velocity shown is 1.3 × 10⁶ cm/s).