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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 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.
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 ...
The hosts of the Today show are starting their mornings in the City of Lights. Hoda Kotb, Savannah Guthrie, Al Roker and Craig Melvin will cover the 2024 Paris Olympic Games — which take place ...
Today (also called The Today Show) is an American morning television show that airs weekdays from 7:00 a.m. to 11:00 a.m. on NBC.The program debuted on January 14, 1952. It was the first of its genre on American television and in the world, and after 72 years of broadcasting it is fifth on the list of longest-running United States television serie
The hosts of the Today show have shared several glimpses into their family lives on the show and online over the years. Savannah Guthrie, Hoda Kotb, Al Roker and more of the NBC morning show stars ...
Like most of the hosts on this list, Dreyer participates in a number of projects outside of Today, including Earth Odyssey with Dylan Dreyer—a Saturday morning show on NBC—and Off the Rails, a ...
Current anchor(s) Debut ABC: This Week: 1 hour (with commercials) Sundays 9:00am: George Stephanopoulos (with Martha Raddatz and Jonathan Karl) November 15, 1981 CBS: Face the Nation: 10:30am: Margaret Brennan: November 7, 1954 Fox Fox News Sunday: 9:00am: Shannon Bream: April 28, 1996 NBC: Meet the Press: Kristen Welker: November 6, 1947 PBS ...