Fig. 8From: Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation dataSpread F occurrence and horizontal velocities in m s−1 (color coded) as a function of day of year and daytime for Tucumán in 2014 estimated from the tilt Δf D /ΔT. Horizontal black thick lines indicate data gaps; dashed blue curves show the times of sunset and sunrise at the altitude of 0 kmBack to article page