Schumann resonances
A Schumann resonance is a resonant frequency of a set of several Extremely Low Frequency (ELF) oscillations of the Earth's electromagnetic field between the ground and reflective regions of the ionosphere, triggered by lightning.
A Schumann resonance is a resonant frequency of a set of several Extremely Low Frequency (ELF) oscillations of the Earth's electromagnetic field between the ground and reflective regions of the ionosphere, triggered by lightning.