Difference between revisions of "Atmospherics"

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<div class="definition"><div class="short_definition">(<br/>''Also called'' atmospheric interference, strays, sferics.) The [[radio frequency]] electromagnetic  [[radiation]] originating, principally, in the irregular surges of charge in thunderstorm  [[lightning discharges]].</div><br/> <div class="paragraph">Atmospherics are heard as a quasi-steady background of crackling [[noise]] ([[static]]) on certain radio  frequencies, such as those used to broadcast AM radio signals. Since any [[acceleration]] of [[electric  charge]] leads to [[emission]] of [[electromagnetic radiation]], and since the several processes involved  in propagation of [[lightning]] lead to very large charge accelerations, the [[lightning channel]] acts  like a huge [[transmitter]], sending out [[radiation]] with frequencies of the order of 10 kHz. Atmospherics  may occasionally be detected at distances in excess of 3500 km (2000 mi) from their  source. Advantage has been taken of this characteristic by using radio direction-finding equipment  to plot [[cloud-to-ground lightning]] locations, and to locate active [[thunderstorm]] areas in remote  regions and in-between weather reporting stations.</div><br/> </div>
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<div class="definition"><div class="short_definition">(''Also called'' atmospheric interference, strays, sferics.) The [[radio frequency]] electromagnetic  [[radiation]] originating, principally, in the irregular surges of charge in thunderstorm  [[lightning discharges]].</div><br/> <div class="paragraph">Atmospherics are heard as a quasi-steady background of crackling [[noise]] ([[static]]) on certain radio  frequencies, such as those used to broadcast AM radio signals. Since any [[acceleration]] of [[electric charge|electric  charge]] leads to [[emission]] of [[electromagnetic radiation]], and since the several processes involved  in propagation of [[lightning]] lead to very large charge accelerations, the [[lightning channel]] acts  like a huge [[transmitter]], sending out [[radiation]] with frequencies of the order of 10 kHz. Atmospherics  may occasionally be detected at distances in excess of 3500 km (2000 mi) from their  source. Advantage has been taken of this characteristic by using radio direction-finding equipment  to plot [[cloud-to-ground flash|cloud-to-ground lightning]] locations, and to locate active [[thunderstorm]] areas in remote  regions and in-between weather reporting stations.</div><br/> </div>
 
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Latest revision as of 15:26, 25 April 2012



atmospherics

(Also called atmospheric interference, strays, sferics.) The radio frequency electromagnetic radiation originating, principally, in the irregular surges of charge in thunderstorm lightning discharges.

Atmospherics are heard as a quasi-steady background of crackling noise (static) on certain radio frequencies, such as those used to broadcast AM radio signals. Since any acceleration of electric charge leads to emission of electromagnetic radiation, and since the several processes involved in propagation of lightning lead to very large charge accelerations, the lightning channel acts like a huge transmitter, sending out radiation with frequencies of the order of 10 kHz. Atmospherics may occasionally be detected at distances in excess of 3500 km (2000 mi) from their source. Advantage has been taken of this characteristic by using radio direction-finding equipment to plot cloud-to-ground lightning locations, and to locate active thunderstorm areas in remote regions and in-between weather reporting stations.