Scientists believe that the Schumann resonance is due to the space between the surface of the Earth and the ionosphere acting as a resonant cavity that is then excited by energy from lightning strikes.
The lowest-frequency (and highest-intensity) mode of the Schumann resonance is at a frequency of approximately 7.8 Hz.
The phenomenon is named after W. O. Schumann, who predicted this phenomenon in the 1950s, and helped detect its existence.
See also: Earth's magnetic field, radiant energy, plasma
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