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Schumann resonance (named after the German physicist and electrical engineer Winfried Otto Schumann) is the name given to the phenomenon that electromagnetic waves of certain frequencies form standing waves along the circumference of the earth. The sufficiently conductive earth's surface (mostly salt water) and the highly conductive ionosphere above it delimit a spherical shell-shaped cavity resonator, from the dimensions of which possible resonance frequencies can be calculated. Waves that are in the same phase again after having circumnavigated the earth (i.e. the circumference of the earth is an integral multiple of the wavelength) are amplified, others cancel each other out. This results in a lowest resonance frequency averaging around 7.8 Hz. This tuning fork transmits the Schumann frequency into the audible range through five-fold "octaving". This results in a frequency of 250.65 Hz.
Additional product information
Planet Schumann
Frequency 250.56 Hz
Length 165 mm
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