Fig. 4.From: Propagation of large amplitude ionospheric disturbances with velocity dispersion observed by the SuperDARN Hokkaido radar after the 2011 off the Pacific coast of Tohoku EarthquakeLine plots of Hokkaido radar line-of-sight velocities of ranges 14, 16, 18, … and 32 (all for beam 4), with 5-min smoothing applied. Echoes with line-of-sight velocities beyond ±200 m/s have been excluded. The positive velocities are toward the radar.Back to article page