Interhemispheric currents mapped into the equatorial plane. The colour-scale indicates the size and direction of the interhemispheric currents. The solid line is a contour of zero interhemispheric current. The dashed lines show the L-shells 12 and 15 between which the current system proposed by Southwood & Kivelson (2007) is predicted to flow. These dashed lines are magnetically connected to the equivalent dashed lines in Fig. 7. The dotted lines shows L-shells at a spacing of 3R_S, thus indicating the locations of the five L-shell ranges used to produce Fig. 9.