Fig. 28
From: Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars
LSTID signatures observed simultaneously by HOK and GEONET-GPS receiver network on 15 December 2006. The upper panel shows Doppler velocity of GS echoes measured by HOK, and the lower panel shows GEONET-GPS total electron content (TEC) perturbations (sampled along the direction of HOK beam 0 at lower latitudes) plotted as a function of UT and geographic latitude. In the lower panel, the TEC perturbation values were obtained by subtracting 60-min running average. Three major disturbances are visible in each map, denoted as events 1–3. Adapted from Fig. 5 of Hayashi et al. (2010)