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Auroral kilometric radiation - A theoretical reviewAuroral kilometric radiation (AKR) is a high-density radio wave radiation in the frequency band from 50 to 750 kHz, with a peak around 250 kHz, that has been observed emanating from the auroral zone. In connection with its low frequency, the radiation can not penetrate through the ionosphere to earth, so all observations have been made by satellite. The AKR is closely correlated with the occurrence of discrete auroral arcs, which are believed to be generated by intense inverted V electron precipitation bands. A review is presented of several theories which have been proposed to explain the observed AKR. Attention is given to the conversion of electron cyclotron wave to O mode, the coherent amplification of gyroemission by velocity space instabilities, beam-driven electromagnetic instability via low-frequency turbulence, soliton radiation, loss cone instability, nonlinear beating of electrostatic waves, and the beam amplification of electromagnetic wave via coherent EIC density fluctuations.
Document ID
19820030700
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Grabbe, C. L.
(Iowa, University Iowa City, IA, United States)
Date Acquired
August 10, 2013
Publication Date
November 1, 1981
Publication Information
Publication: Reviews of Geophysics and Space Physics
Volume: 19
Subject Category
Geophysics
Report/Patent Number
AD-A108411
Report Number: AD-A108411
Accession Number
82A14235
Funding Number(s)
CONTRACT_GRANT: NGL-16-001-043
Distribution Limits
Public
Copyright
Other

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