The Schumann resonance is a set of peaks in the ELF portion of the Earth's electromagnetic field spectrum.

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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