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- Extremely_low_frequency abstract "Extremely low frequency (ELF) waves are 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 man-made communication systems. ELF waves can penetrate seawater, which makes them useful in communication with submarines. The US and Russia are the only nations known to have constructed ELF communication facilities, with India being in the process of constructing one. The frequency of alternating current flowing in electric power grids, 50 or 60 Hz, falls within this frequency band, and power grids are an unintentional source of ELF radiation.".
- Extremely_low_frequency thumbnail Clam_Lake_ELF.jpg?width=300.
- Extremely_low_frequency wikiPageExternalLink mono80.pdf.
- Extremely_low_frequency wikiPageExternalLink inspire.html.
- Extremely_low_frequency wikiPageExternalLink ehc35.htm.
- Extremely_low_frequency wikiPageExternalLink longitudinal-electric-waves.
- Extremely_low_frequency wikiPageExternalLink www.vlf.it.
- Extremely_low_frequency wikiPageExternalLink bands.html.
- Extremely_low_frequency wikiPageExternalLink zevs.htm.
- Extremely_low_frequency wikiPageID "366253".
- Extremely_low_frequency wikiPageRevisionID "604603641".
- Extremely_low_frequency freq "3".
- Extremely_low_frequency hasPhotoCollection Extremely_low_frequency.
- Extremely_low_frequency wave "100000".
- Extremely_low_frequency subject Category:IARC_Group_2B_carcinogens.
- Extremely_low_frequency subject Category:Radio_spectrum.
- Extremely_low_frequency comment "Extremely low frequency (ELF) waves are 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.".
- Extremely_low_frequency label "Extremely Low Frequency".
- Extremely_low_frequency label "Extremely low frequency".
- Extremely_low_frequency label "Extremely low frequency".
- Extremely_low_frequency label "Extremely low frequency".
- Extremely_low_frequency label "Extremely low frequency".
- Extremely_low_frequency label "Extrêmement basse fréquence".
- Extremely_low_frequency label "Frecuencia extremadamente baja".
- Extremely_low_frequency label "Frequência extremamente baixa".
- Extremely_low_frequency label "極低頻".
- Extremely_low_frequency label "極超長波".
- Extremely_low_frequency sameAs Extremely_Low_Frequency.
- Extremely_low_frequency sameAs Frecuencia_extremadamente_baja.
- Extremely_low_frequency sameAs Extrêmement_basse_fréquence.
- Extremely_low_frequency sameAs Frekuensi_amat_rendah.
- Extremely_low_frequency sameAs Extremely_low_frequency.
- Extremely_low_frequency sameAs 極超長波.
- Extremely_low_frequency sameAs 초저주파.
- Extremely_low_frequency sameAs Extremely_low_frequency.
- Extremely_low_frequency sameAs Extremely_low_frequency.
- Extremely_low_frequency sameAs Frequência_extremamente_baixa.
- Extremely_low_frequency sameAs m.01__ql.
- Extremely_low_frequency sameAs Q741979.
- Extremely_low_frequency sameAs Q741979.
- Extremely_low_frequency wasDerivedFrom Extremely_low_frequency?oldid=604603641.
- Extremely_low_frequency depiction Clam_Lake_ELF.jpg.
- Extremely_low_frequency isPrimaryTopicOf Extremely_low_frequency.
