Left: two concentrations of flux of different polarity (thick, vertical lines), smoothed absolute value of the magnetic field of the separate concentrations (red and blue Gaussian curves), and smoothed absolute value of the total magnetic field. Right: smoothed absolute value of the total magnetic field (black line) and inflow velocity profile resulting from Eq. (3)(purple line). We have assumed a flux of 4 × 10¹⁸ Mx for the single concentrations.