![]() ![]() In the US patent 787 412 filed on and issued April 18, 1905, Tesla writes:įor the present it will be sufficient to state that the planet behaves like a perfectly smooth or polished conductor of inappreciable resistance with capacity and self induction uniformly distributed along the axis of symmetry of wave propagation and transmitting slow electrical oscillations without sensible distortion and attenuation. He suggested that energy was reflected at the antipode of his Colorado Springs transmitter in such a manner that the standing waves were formed. Tesla proposed that the Earth itself could be set into a resonant mode at frequencies of the order of 10 Hz. There are some claims that Tesla actually observed the resonance, however as in this and many other cases related to Tesla’s work, there is no written evidence for such claims. The scientists are Nicola Tesla, Serbian-American inventor, physicist, and engineer who studied similar phenomena at the beginning of the 20th century (1900-1905), and George Francis FitzGerald, the Irish theoretical physicist 1893, who actually should be considered as the first to theoretically predict this phenomenon. Although Schumann initiated the modern study of ELF propagation two names emerge as the scientists who knew of at least the lowest ELF mode around the Earth. The phenomenon is named after the German electrical engineer Winfried Otto Schumann who applied the resonant cavity model to the Earth-ionosphere cavity in 1952 and published the obtained results in several papers. The average measured frequencies of the five lowest wave modes are, approximately, 7.8, 14.3, 20.8, 27.3, and 33.8 Hz, which fall in the Extremely Low Frequency (ELF) range. The induced standing electromagnetic waves have wavelengths related to the radius of the cavity. These two layers form a resonant cavity, which supports both longitudinal and transverse electromagnetic waves. lightning, generate electromagnetic waves that propagate between the surface and the lower boundary of the ionosphere (~100 km). The Earth can be regarded as a nearly conducting sphere, surrounded by an atmosphere which is essentially a thin dielectric layer that extends up to the ionosphere, for which the conductivity is also substantial.Ītmospheric electric discharges, e.g. ![]() crest and throughs are perfectly alligned) and the resonance phenomenon develops such that the amplitude of the original wave is amplified. Each lightning event creates electromagnetic waves that begin to circle around the Earth caught between the Earth surface and the lower levels of the ionosphere.Ī wave which flows around the Earth reaches itself in such a manner that it completely coincides with itself (i.e. ![]() There are about 2000 thunderstorms taking place on Earth at every moment of time and approximately 50 lightning occurrences every second. This phenomenon, known as Schumann resonance (SR), corresponds to electromagnetic oscillations of the surface-ionosphere cavity. A broadband electromagnetic sources, such as lightning, excite the cavity forming a resonant state provided the average equatorial circumference is approximately equal to an integral number of wavelengths of the electromagnetic waves. ![]()
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