Fig. 7From: Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation dataSequence of ionograms measured in Sanya (18.3°N, 109.6°W) at a 14:15, b 14:45, c 15:00, and d 15:30 UT on March 16, 2014Back to article page