Top (top panel) and lateral (bottom panel) views of the distribution of current density at t = 782.5 s for the second numerical experiment when plasma is moved southward over the positive polarity P11–P12. The arrows show the current direction, and the size and color of the arrows indicate the current density amplitude. Also shown are the Z component of the magnetic field at the bottom of the simulation box and corresponding magnetic field lines. The lateral view is along the positive X axis.