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The fundamental Schumann resonance is at approximately 7.83 Hz, the frequency at which the wavelength equals the circumference of the Earth, and higher harmonics occur at 14.1, 20.3, 26.4, and 32.4 Hz, etc. Lightning strikes excite these resonances, causing the Earth–ionosphere cavity to "ring" like a bell, resulting in a peak in the noise ...
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The global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonances are the principal background in the part of the electromagnetic spectrum [2] from 3 Hz through 60 Hz [3] and appear as distinct peaks at extremely low frequencies around 7.83 Hz (fundamental), 14.3, 20.8, 27.3, and 33.8 Hz.
Schumann in a Josef Kriehuber etching from 1839, the year preceding his marriage to Clara. It was at this time that he began to compose vocal music prolifically. The following is a list of the complete vocal output of Robert Schumann (8 June 1810 – 29 July 1856). Schumann was one of the most prolific composers of the nineteenth century.
In 1849, Robert Schumann explored the horn as a solo instrument, dedicating to it an "Adagio and Allegro," Op. 70, before embarking on the composition of an orchestral work featuring four solo horns (having also composed the "Five Songs based on Heinrich Laube's Hunting Compendium" for men's choir and four horns, Op. 137 that same year).