Definitions for extremely low frequency
ex·treme·ly low fre·quen·cy

Princeton's WordNetRate this definition:0.0 / 0 votes

1. extremely low frequency, ELFnoun

   below 3 kilohertz

WikipediaRate this definition:0.0 / 0 votes

1. 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.

ChatGPTRate this definition:0.0 / 0 votes

1. extremely low frequency

   Extremely low frequency (ELF) refers to a band of radio frequencies that usually range from 3 to 30 hertz. This term is often used in scientific fields such as radio astronomy, geophysics, and in climate and earthquake monitoring. ELF waves have the capability to penetrate deep sea and earth layers, enabling communication with submarines and exploration of the underground/undersea geological structures.

WikidataRate this definition:0.0 / 0 votes

1. Extremely low frequency

   Extremely low frequency waves are electromagnetic radiation with frequencies from 3 to 300 Hz, and corresponding wavelengths from 100,000 to 1000 kilometers. In atmosphere science, an alternative definition is usually given, from 3 Hz to 3 kHz. In the related magnetosphere science, the lower frequency electromagnetic oscillations 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, so the US and Russian militaries have used ELF transmission facilities to communicate with their submerged submarines. 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.

Matched Categories

1. • Radio Frequency

How to pronounce extremely low frequency?

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How to say extremely low frequency in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of extremely low frequency in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of extremely low frequency in Pythagorean Numerology is: 3

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=extremely low frequency
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Extremely_Low_Frequency
3. ^ ChatGPT
   https://chat.openai.com
4. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=extremely low frequency