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Auroral kilometric radiation (AKR) is the intense radio radiation emitted in the acceleration zone (at a height of three times the radius of the Earth) of the polar lights.[1][2][3][4] The radiation mainly comes from cyclotron radiation from electrons orbiting around the magnetic field lines of the Earth. The radiation has a frequency of between 50 and 500 kHz and a total power of between about 1 million and 10 million watts. The radiation is absorbed by the ionosphere and therefore can only be measured by satellites positioned at vast heights, such as the Fast Auroral Snapshot Explorer (FAST). According to the data of the Cluster mission, it is beamed out in the cosmos in a narrow plane tangent to the magnetic field at the source. The sound produced by playing AKR over an audio device has been described as "whistles", "chirps", and even "screams"[citation needed].
As some other planets emit cyclotron radiation too, AKR could be used to learn more about Jupiter, Saturn, Uranus and Neptune, and to detect extrasolar planets.
References
edit- ^ Masson, Arnaud (2008-06-27). "Beamed radio emission from Earth". ESA. Retrieved 2008-07-01.
- ^ Grabbe, C. L. (1981-11-01). "Auroral kilometric radiation - A theoretical review". Reviews of Geophysics and Space Physics. 19 (4): 627. Bibcode:1981RvGSP..19..627G. doi:10.1029/RG019i004p00627.
- ^ Fogg, A. R.; Jackman, C. M.; Waters, J. E.; Bonnin, X.; Lamy, L.; Cecconi, B.; Issautier, K.; Louis, C. K. (May 2022). "Wind/WAVES Observations of Auroral Kilometric Radiation: Automated Burst Detection and Terrestrial Solar Wind - Magnetosphere Coupling Effects". Journal of Geophysical Research: Space Physics. 127 (5). Bibcode:2022JGRA..12730209F. doi:10.1029/2021JA030209. ISSN 2169-9380.
- ^ Baumjohann, Wolfgang; Treumann, R. A. (2022-12-08). "Auroral kilometric radiation—The electron cyclotron maser paradigm". Frontiers in Astronomy and Space Sciences. 9: 389. arXiv:2302.02344. Bibcode:2022FrASS...953303B. doi:10.3389/fspas.2022.1053303. ISSN 2296-987X.
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