Fig. 13From: Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation data a, b S4max values as a function of local time and altitude for Tucumán and Taiwan, respectively. c, d S4max values as a function of local time and altitude at the geomagnetic equator magnetically conjugated with Tucumán and Taiwan, respectively. e, f S4max values as a function of season and altitude for Tucumán and Taiwan, respectivelyBack to article page