Fig. 7.From: Giant ionospheric disturbances observed with the SuperDARN Hokkaido HF radar and GPS network after the 2011 Tohoku earthquakeSolid and broken straight lines along which TEC keograms are generated. Horizontal distances from point 1 (0 km) to points 2 (1265 km) and 3 (1140 km) and those from Rikubetsu along beam 4 are shown. The direction of beam 4 is closely aligned along two lines.Back to article page