Is the Schumann frequency increasing in value?

Numerous and very frequent thunderstorms across the world via lightning generate electromagnetic energy which forms a wave that begins to circle the Earth, trapped between the ground and the ionosphere. Schuman resonance is a set of frequencies representing frequencies of the standing electromagnetic waves which propagate around the Earth between the surface of the earth and the lower layers of the ionosphere. The ionosphere is the electrically charged part of the atmosphere extending from about 60 km to 500 km above the Earth’s surface. The fundamental Schumann frequency is around 7.83 Hz which corresponds to the wave with the smallest number of crests and troughs. Then there are harmonics at approximately 14.3, 20.9, 27.3 and 33.8 Hz and even above, however these higher harmonics are very weak in energy. In Fig. 1 the red wave has the lowest frequency since it has only three crests and three troughs. The blue wave has twice the frequency of the red wave and the frequency of the green wave is approximately seven times the frequency of the red wave. Now, in order for the Schumann frequency of the wave to fundamentally change the shape or the diameter of the Earth would have to change. Also, frequency could hypothetically change if the shape and/or the size of the earth-ionosphere cavity would change. However, none of these changes happen. Minor changes in frequency may originate due to the variations of the atmospheric pressure and/or incoming solar activity, especially due to solar storms which have an effect on the ionosphere. The ionosphere, which prevents the entering of the cosmic radiation in the atmosphere, may also experience small changes which have a minor effect on the frequency. All these changes, even if happened simultaneously, introduce very small variations in the frequency not exceeding 0.5Hz. The power of the signal is proportional to the amplitude of the wave. An illustration of power (amplitude) and frequency of the wave is presented in Fig. 1, where blue signals f 1 and f 2 have the same frequency but the dotted blue wave has higher energy. Although the signal of 7.83 Hz carries the most energy, the real changes occur in the power of the harmonics, particularly 2nd (14.3 Hz), 3 rd (20.9 Hz) and 4th (27.3 Hz). At certain times, these harmonics may become energetically dominant. For example on April 24th 2020, the dominant power was at the 20th harmonic (156 Hz). Many people have erroneously assumed that the Schumann frequency has risen to 156 Hz. But that was not the case, only there was an unusually large increase of power at this frequency.