Fig. 9.From: Giant ionospheric disturbances observed with the SuperDARN Hokkaido HF radar and GPS network after the 2011 Tohoku earthquakeTime and ground range variations of Doppler velocity (with echo power higher than 20 dB) on beam 4 and GPS-TEC keogram along the broken line in Fig. 7. Echoes within a dotted gray rectangle are partly contaminated by 2-hop echoes.Back to article page