Schumann Resonances
Figure 1 - Dependence of factor of merit of the Schumann resonance on the local time.
Figure 2 - Dependence of amplitudes of the Schumann resonance in Hertz on the local time.
Figure 3 - Schumann Resonances
Figure 4 - Dependence of frequencies of the Schumann resonance in hertz on the local time.
Local time is expressed in hours of Tomsk summer standard time (TSST). TSST = UTC + 7 hours.
https://geocenter.info/en/monitoring/schumann