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- Extremely_low_frequency abstract "Extremely low frequency (ELF) is the ITU designation for electromagnetic radiation (radio waves) with frequencies from 3 to 30 Hz, and corresponding wavelengths from 100,000 to 10,000 kilometers. 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. The US, Russia, and India are the only nations known to have constructed ELF communication facilities. The U.S. facilities were used between 1985 and 2004 but are now decommissioned. ELF waves can also penetrate significant distances into earth or rock, and \"through-the-earth\" underground mine communication systems use frequencies of 300 to 3000 Hz. The frequency of alternating current flowing in electric power grids, 50 or 60 Hz, also falls within the ELF band, making power grids an unintentional source of ELF radiation.".
- Extremely_low_frequency thumbnail Clam_Lake_ELF.jpg?width=300.
- Extremely_low_frequency wikiPageExternalLink www.vlf.it.
- Extremely_low_frequency wikiPageExternalLink bands.html.
- Extremely_low_frequency wikiPageExternalLink zevs.htm.
- Extremely_low_frequency wikiPageExternalLink mono80.pdf.
- Extremely_low_frequency wikiPageExternalLink inspire.html.
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- Extremely_low_frequency wikiPageID "366253".
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- Extremely_low_frequency wikiPageWikiLink Amateur_radio.
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- Extremely_low_frequency wikiPageWikiLink Atmospheric_sciences.
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- Extremely_low_frequency wikiPageWikiLink Category:IARC_Group_2B_carcinogens.
- Extremely_low_frequency wikiPageWikiLink Category:Radio_spectrum.
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- Extremely_low_frequency wikiPageWikiLink Electromagnetic_radiation.
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- Extremely_low_frequency wikiPageWikiLink Through-the-earth_mine_communications.
- Extremely_low_frequency wikiPageWikiLink Titan_(moon).
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- Extremely_low_frequency wikiPageWikiLink ZEVS_(transmitter).
- Extremely_low_frequency wikiPageWikiLink File:Clam_Lake_ELF.jpg.
- Extremely_low_frequency wikiPageWikiLinkText "1".
- Extremely_low_frequency wikiPageWikiLinkText "3 Hz".
- Extremely_low_frequency wikiPageWikiLinkText "3 Hz".
- Extremely_low_frequency wikiPageWikiLinkText "ELF waves".
- Extremely_low_frequency wikiPageWikiLinkText "ELF".
- Extremely_low_frequency wikiPageWikiLinkText "Extremely low freq.".
- Extremely_low_frequency wikiPageWikiLinkText "Extremely low frequency".
- Extremely_low_frequency wikiPageWikiLinkText "Project ELF".
- Extremely_low_frequency wikiPageWikiLinkText "extremely low frequencies".
- Extremely_low_frequency wikiPageWikiLinkText "extremely low frequency electromagnetic waves".
- Extremely_low_frequency wikiPageWikiLinkText "extremely low frequency".
- Extremely_low_frequency wikiPageWikiLinkText "extremely-low-frequency".
- Extremely_low_frequency wikiPageWikiLinkText "natural radio waves".
- Extremely_low_frequency freq "3".
- Extremely_low_frequency wave "100000".