General concepts on the generation of auroral kilometric radiation

Physics

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Auroral Spectroscopy, Kilometric Waves, Radio Auroras, Terrestrial Radiation, Electron Precipitation, Electrostatic Waves, Trapped Particles, Wave Amplification, Wave Dispersion

Scientific paper

An investigation is conducted of the generation of auroral kilometric radiation (AKR) by upgoing, electrostatically trapped auroral electrons that form a loss cone distribution, and downgoing precipitating electrons in regions where the plasma/cyclotron frequency ratio is much lower than unity. A number of concepts supplementing the model originated by Wu and Lee (1979) for the generation of AKR are obtained. It is found that only two high frequency modes can be responsible for AKR: the L-O mode and the R-X mode. The latter is considered the more likely candidate, since the wave characteristics of its upper frequency branch are consistent with AKR observations. It is suggested that linear theory offers an adequate explanation of the generation of AKR excited in the R-X mode, and that the intense wave generation should occur at wave frequencies just above the right-hand cutoff frequency, with wave normal angles of 75-105 deg.

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