Time sequence of the radial profiles of the drift velocity of the magnetic flux 〈v_B〉_H normalized by the Kepler speed from |$t=1000\, t_{\mathrm{K0}}$| to |$t=2000\, t_{\mathrm{K0}}$|⁠. The radial profiles of 〈v_B〉_H averaged over |$1000\, t_{\mathrm{K0}}\le t\le 2000\, t_{\mathrm{K0}}$| are shown by the red line. The vertical dashed lines correspond to R = R_η and R_ch from left to right.