Fig. 8From: Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radarsa–d GPS TEC maps depicting evolution of the polar tongue of ionization (TOI) with SuperDARN convection patterns overlaid. e–h SuperDARN LOS velocity measurements from radars located at mid-latitudes on the dayside and extending into the polar cap. Reproduced from Fig. 7 of Thomas et al. (2013)Back to article page