The Schumann resonances
The Schumann resonances (SR) are global electromagnetic resonances excited within the Earth-ionosphere waveguide, primarily by lightning discharges. These resonances occur in the extremely low frequency (ELF) range, with resonant frequencies around 8, 14, 20, 26, . . . Hz. This Chapter is dedicated to the theory, phenomenology, and measurements of Schumann resonances.
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