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Schumann resonances are a set of fundamental electromagnetic resonances that occur in the Earth-ionosphere cavity. These resonances are named after physicist Winfried Otto Schumann, who predicted their existence in 1952. Here's how they work: 1. **Cavity Structure**: The Earth and the ionosphere act like a gigantic waveguide.

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  1. Electromagnetic radiation
  2. Electrodynamics
  3. Dynamical systems
  4. Fields of mathematics
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