Fig. 2From: El Niño–Southern Oscillation effect on ionospheric tidal/SPW amplitude in 2007–2015 FORMOSAT-3/COSMIC observationsWavelet power spectra of a, b the TEC DW1, c, d DE3, and e, f SPW4 amplitude anomalies averaged within the latitude of a, c, e 0° to 30°N and b, d, f 0° to 30°S. Black curves indicate the cone of influence zone of the wavelet analysis. The panels above the spectra show the amplitude anomalies Back to article page