NationMaster - Encyclopedia: Skywave

Skywave is the propagation of radio waves by the refraction caused by the Earth's highly charged ionosphere. A skywave is a radio wave from a distant radio station (or rarely, a TV station) that is refracted in the ionosphere. It brings in distant stations at night as clear as local stations. Image File history File links Merge-arrows. ... The ionosphere is the part of the atmosphere that is ionized by solar radiation. ... The word propagation can mean: Multiplication or increase, as by natural reproduction. ... Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna. ... This article refers to refraction in waves. ... Jump to: navigation, search Earth, also known as the Earth, Terra, and (mostly in the 19th century) Tellus, is the third-closest planet to the Sun. ... The ionosphere is the part of the atmosphere that is ionized by solar radiation. ... A radio station is a sound broadcasting service. ... A television station is a type of radio station that broadcasts both audio and video to television receivers in a particular area. ... This article refers to refraction in waves. ...

Low to mid frequencies below approximately 10 MHz (longer than 30 meters) including broadcasts in the mediumwave and shortwave bands (and to some extent longwave), travel most efficiently this way at night, acting more like the Earth's natural electrical field than other higher frequencies above 30 MHz (shorter than 10 Meters) which have properties more akin to light). Frequencies Lower than 30 kHz have a wavelength longer than the distance between the Earth and the Ionosphere. Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... The word broadcast can refer to: Broadcasting, the transmission of audio and video signals. ... Mediumwave radio transmissions (sometimes called Medium frequency or MF) are those between the frequencies of 300 kHz and 3000 kHz. ... A Grundig Shortwave receiver Shortwave radio operates between the frequencies of 3,000 kHz and 30 MHz (30,000 kHz) and came to be referred to as such in the early days of radio because the wavelengths associated with this frequency range were shorter than those commonly in use at... Longwave radio frequencies are those below 500 kHz, which correspond to wavelengths longer than 600 meters. ... In physics, an electric field or E-field is an effect produced by an electric charge that exerts a force on charged objects in its vicinity. ... Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific setting, electromagnetic radiation of any wavelength. ...

The Ionosphere, though refracting, can usually bend radio waves enough so they come back to the surface of the Earth.The Ionosphere has been called a natural radio "mirror". Because the solar wind "blows" the ionosphere toward the earth on the day side, and away from it on the night side, the refractive layer of the ionosphere is much higher above the surface at night. The amount of ionisation and the distance of the higher charge in the ionosphere effect the amount of refraction. A mirror is a reflective surface that is smooth enough to form an image. ... A solar wind is a stream of charged particles (i. ...

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Categories: Articles to be merged | Radio frequency propagation | Broadcast engineering Clear channel stations are AM radio stations that are designated as such so that only one or two 50,000 watt powerhouses operate at night on each designated frequency, covering a wide area via sky wave propagation. ... TV DX and FM DX are two terms, customarily grouped together, that mean distant reception of TV and FM radio stations, respectively. ... The Kennelly-Heaviside Layer is also known as the E region or just as Heaviside Layer (after Oliver Heaviside). ... Groundwave is the propagation of radio waves close to the surface of the Earth. ... The ionosphere is the part of the atmosphere that is ionized by solar radiation. ... Tropospheric ducting (also known as tropospheric refraction) is a type of radio propagation that tends to happen during periods of stable, anti-cyclonic weather. ... Radio propagation is a term used to explain how radio waves behave when they are transmitted, or are propagated from one point on the Earth to another. ... This is a list of communications, computers, electronic circuits, fiberoptics, microelectronics, medical electronics, reliablity, and semiconductors. ... This is a glossary of antenna-related terms, derived from the Glossary of Telecommunication Terms published as Federal Standard 1037C. Please see the Federal Standard article for copyright-related issues, as not all parts of the source document are in the public domain. ... This is a list of telecommunications transmission terms derived from the Glossary of Telecommunication Terms published as Federal Standard 1037C. Please see the Federal Standard article for copyright-related issues, as not all parts of the source document are in the public domain. ...

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