The maser synchrotron instability in an inhomogeneous medium Determination of the spectral intensity of auroral kilometric radiation

Details The maser synchrotron instability in an inhomogeneous medium Determination of the spectral intensity of auroral kilometric radiation The maser synchrotron instability in an inhomogeneous medium Determination of the spectral intensity of auroral kilometric radiation

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113542z&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13542-13558.

Physics

29

Atmospheric Radiation, Auroral Zones, Kilometric Waves, Masers, Synchrotron Radiation, Wave Generation, Electron Distribution, Linear Equations, Wave Propagation

Scientific paper

Recent observations indicated that auroral kilometric radiation (AKR) is mainly emitted in cold plasma-depleted regions on the right-handed X mode. In this paper, the spontaneous emission of the X mode is calculated and entered as a source term in the linear transfer equation of this mode. The solution of this equation yields the spectral intensity due to amplified spontaneous emission at distance R from the source. It is shown that the maser synchrotron instability mechanism can account for the observed AKR intensities, although it requires the presence of nonthermal features at 13-20 keV in the electronic distribution. The study has shown that no nonlinear effect occurs for the generation of most of the AKR events, while the saturation level due to a trapping-type mechanism corresponds very well to the maximum observed AKR spectral intensities.

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