Fig. 3From: El Niño–Southern Oscillation effect on ionospheric tidal/SPW amplitude in 2007–2015 FORMOSAT-3/COSMIC observationsWavelet spectra of a the F10.7 index, and TIDI zonal wind DE3 amplitude anomalies in b the Northern and c Southern Hemispheres. The dash lines divide the spectra into three period intervals of 0–12 months, 12–24 months, and 24–48 monthsBack to article page