Extremely Low Frequency - traduzione in greco
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Extremely Low Frequency - traduzione in greco

THE 3-30 HZ RANGE OF THE ELECTROMAGNETIC SPECTRUM
Extremely Low Frequency; Extremely Low Frequencies; Super extremely low frequency; Super Extremely Low Frequency; Below Extremely Low Frequency Band; ELF wave
  • 1982 aerial view of the U.S. Navy [[Clam Lake, Wisconsin]], ELF transmitter facility, used to communicate with deeply submerged submarines. The rights of way of the two perpendicular 14 mile (23 km) overhead transmission lines that constituted the [[ground dipole]] antenna which radiated the ELF waves can be seen at lower left.
  • Typical spectrum of ELF electromagnetic waves in the Earth's atmosphere, showing peaks caused by the [[Schumann resonances]]. The Schumann resonances are the resonant frequencies of the spherical Earth-ionosphere cavity. Lightning strikes cause the cavity to "ring" like a bell, causing peaks in the noise spectrum. The sharp power peak at 50 Hz is caused by radiation from global [[electric power grid]]s. The rise of the noise at low frequencies ''(left side)'' is radio noise caused by slow processes in the Earth's [[magnetosphere]].

Extremely Low Frequency         
εξαιρετικά χαμηλή συχνότητα
εξαιρετικά χαμηλή συχνότητα      
Extremely Low Frequency
Low Countries         
  • Southern part of the Low Countries with bishopry towns and abbeys ca. 7th century.
  • The Low Countries from 1556 to 1648
HISTORICAL COASTAL LANDSCAPE IN NORTH WESTERN EUROPE
Low countries; History of Low Countries; The Low Countries; Lower Countries; Low country; De Nederlanden; De Lage Landen; Les Pays-Bas; Lage Landen; Netherlands (region); Netherlands (historical region); Nederlanden
κάτω χώρες

Definizione

low frequency
¦ noun (in radio) 30-300 kilohertz.

Wikipedia

Extremely low frequency

Extremely low frequency (ELF) is the ITU designation for electromagnetic radiation (radio waves) with frequencies from 3 to 30 Hz, and corresponding wavelengths of 100,000 to 10,000 kilometers, respectively. In atmospheric science, an alternative definition is usually given, from 3 Hz to 3 kHz. In the related magnetosphere science, the lower frequency electromagnetic oscillations (pulsations occurring below ~3 Hz) are considered to lie in the ULF range, which is thus also defined differently from the ITU radio bands.

ELF radio waves are generated by lightning and natural disturbances in Earth's magnetic field, so they are a subject of research by atmospheric scientists. Because of the difficulty of building antennas that can radiate such long waves, ELF frequencies have been used in only a very few human-made communication systems. ELF waves can penetrate seawater, which makes them useful in communication with submarines, and a few nations have built military ELF transmitters to transmit signals to their submerged submarines, consisting of huge grounded wire antennas (ground dipoles) 15–60 km (9–37 mi) long driven by transmitters producing megawatts of power. The United States, Russia, India, and China are the only countries known to have constructed these ELF communication facilities. The U.S. facilities were used between 1985 and 2004 but are now decommissioned.

Esempi dal corpus di testo per Extremely Low Frequency
1. Conflicting studies × Swedish study finds threefold increased risk of childhood leukaemia in families living within 50 metres of power lines. × Canadian study finds 80 per cent increased risk for children within 100 metres of lines. × Analysis of nine studies finds doubling of childhood leukaemia in families exposed to magnetic fields of 0.4 microteslas (within 60 metres). × International Agency for Cancer Research classifies extremely low frequency magnetic fields as "possibly carcinogenic". × UK Childhood Cancer Study concludes electromagnetic fields "are not principal causes, if at all, of leukaemia in children." × Oxford Children‘s cancer group concludes living within 600 metres of lines could account for five cases of leukaemia a year.