Fig. 12From: Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation data a Global distribution of S4max values for the 200–300 km altitude range. b Dependence of S4max on altitude and latitude for the longitude of maximum in Fig. 8a. c, d S4max values for the 200–300 km altitude range as a function of local time and season over Tucumán and Taiwan, respectivelyBack to article page