Fig. 9
From: Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars
Average patterns of Northern Hemisphere ionospheric convection calculated from SuperDARN data collected during periods of increased geomagnetic activity (Kp ≥ 3) between June 2005 and April 2006. Contours of the global solution of electrostatic potential are shown as black lines spaced every 4 kV. Adapted from Fig. 12 of Baker et al. (2007)