Schumann resonances

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Science and technology

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What Wikipedia says

The Schumann resonances (SR) are a set of spectral peaks in the extremely low frequency portion of the Earth's electromagnetic field spectrum. They are global electromagnetic resonances generated and excited by lightning discharges in the cavity formed by the Earth's surface and the ionosphere.

Excerpt from the Wikipedia article “Schumann resonances”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Rudolfs Davis Strazds, CC BY-SA 4.0, via Wikimedia Commons.