Fig. 11From: Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation dataAzimuths (top) and horizontal propagation (bottom) velocities of oblique spread structures (OSSs) as a function of daytime for Taiwan in 2014. Values determined by the time delay method are shown in blue; and velocities determined by the tilt method are shown in magenta Back to article page