The Schumann resonances (SR) are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earths electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, generated and excited by lightning discharges in the cavity formed by the Earths surface and the ionosphere.A community of people like to keep an eye on the Schumann. This is a simple way to quickly check where it is.
Schumann Resonance
