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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.
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 ...
Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content .
For Earth Day on April 22, interesting facts including who invented it, why it's on that date, and how it turned into a global movement.
What on Earth? is an American television program broadcast on Science Channel. It examines strange satellite imagery and speculates on what caused the strange phenomenon. The program debuted in February 2015. It was Science Channel's most watched program and was renewed for a third season in 2016 and a fourth season in 2017. [1] [2]
The dispersion characteristics of the Earth-ionospheric waveguide can be used for locating thunderstorm activity by measurements of the difference of the group time delay of lightning signals at adjacent frequencies up to distances of 10000 km. [7] The Schumann resonances allow to determine the global lightning activity. [9]
For the third annual Call to Earth Day, schools around the world took action to protect the environment.
Science Channel (often simply branded as Science; abbreviated to SCI) is an American pay television channel owned by Warner Bros. Discovery. [1] The channel features programming focusing on science related to wilderness survival, engineering, manufacturing, technology, space, space exploration, ufology and prehistory.