Fig. 5From: Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation dataScintillation index S4 for signals from PRN3 (red) and PRN19 (blue) GPS satellites measured in Tucumán from 00:00 to 04:00 UT on February 2, 2014Back to article page