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==Schumann Resonances== | ==Schumann Resonances== | ||
The Schumann resonances (SR) are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth's electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, excited by lightning discharges in the cavity formed by the Earth's surface and the ionosphere.<ref>http://en.wikipedia.org/wiki/Schumann_resonances]</ref | The Schumann resonances (SR) are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth's electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, excited by lightning discharges in the cavity formed by the Earth's surface and the ionosphere.<ref>http://en.wikipedia.org/wiki/Schumann_resonances]</ref> | ||
==References== | ==References== | ||
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