![]() ![]() ![]() Tesla researched ways to transmit power and energy wirelessly over long distances (via transverse waves, to a lesser extent, and, more readily, longitudinal waves). This observation led to certain peculiar conclusions about the electrical properties of the earth, and which made the basis for his idea for wireless energy transmission. The first documented observations of global electromagnetic resonance were made by Nikola Tesla at his Colorado Springs laboratory in 1899. A new field of interest using Schumann resonances is related to short-term earthquake prediction. More recently, discrete Schumann resonance excitations have been linked to transient luminous events – sprites, elves, jets, and other upper-atmospheric lightning. Effects on Schumann resonances have been reported following geomagnetic and ionospheric disturbances. Schumann resonances have been used to study the lower ionosphere on Earth and it has been suggested as one way to explore the lower ionosphere on celestial bodies. It has been speculated that extraterrestrial lightning (on other planets) may also be detected and studied by means of their Schumann resonance signatures. Owing to the connection between lightning activity and the Earth's climate it has been suggested that they may also be used to monitor global temperature variations and variations of water vapor in the upper troposphere. Observations of Schumann resonances have been used to track global lightning activity. The eighth overtone lies at approximately 59.9 Hz. The peaks exhibit a spectral width of approximately 20% on account of the damping of the respective modes in the dissipative cavity. The higher resonance modes are spaced at approximately 6.5 Hz intervals, a characteristic attributed to the atmosphere's spherical geometry. This lowest-frequency (and highest-intensity) mode of the Schumann resonance occurs at a frequency of approximately 7.83 Hz, but this frequency can vary slightly from a variety of factors, such as solar-induced perturbations to the ionosphere, which comprises the upper wall of the closed cavity. In the normal mode descriptions of Schumann resonances, the fundamental mode is a standing wave in the Earth–ionosphere cavity with a wavelength equal to the circumference of the Earth. Schumann resonances are the principal background in the electromagnetic spectrum beginning at 3 Hz and extend to 60 Hz, and appear as distinct peaks at extremely low frequencies (ELF) around 7.83 (fundamental), 14.3, 20.8, 27.3 and 33.8 Hz. The cavity is naturally excited by electric currents in lightning. ![]() The limited dimensions of the Earth cause this waveguide to act as a resonant cavity for electromagnetic waves in the ELF band. Schumann resonances occur because the space between the surface of the Earth and the conductive ionosphere acts as a closed waveguide. This global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. 5 Speculation about Schumann resonance effects in non-geophysics domains.4.3 Schumann resonances on other planets.4.1.1.2 Influence of the day-night asymmetry.4.1 Dependence on global lightning activity. ![]()
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