Fig. 11.From: Giant ionospheric disturbances observed with the SuperDARN Hokkaido HF radar and GPS network after the 2011 Tohoku earthquake(a) Time and ground range variations of Doppler velocity on beam 4 (Fig. 10(c)) and GPS-TEC keogram along the solid line in Fig. 7, using the same format as Fig. 8(b). (b) Time variation of Doppler velocity map every 2 min. Positive and negative Doppler velocity regions are surrounded by solid and dotted rectangles, respectively. Beam 4 is marked in each figure. (c) Map of Doppler velocity during 1804–1806 JST and TEC at 1805 JST.Back to article page