Physics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.8199c&link_type=abstract
Journal of Geophysical Research, vol. 87, Oct. 1, 1982, p. 8199-8214.
Physics
94
Ion Cyclotron Radiation, Kilometric Waves, Positive Feedback, Radio Auroras, Radio Emission, Self Oscillation, Auroral Arcs, Auroral Zones, Bandwidth, Cyclotron Frequency, Cyclotron Resonance, Feedback Control, International Sun Earth Explorer 1, Radio Spectra, Saturation
Scientific paper
It is noted that in order to compensate for the wave refraction inside the source, the boundary reflection surfaces must converge with altitude, and this implies that the most likely auroral kilometric radiation source would be a thin, local density enhancement, since the refractive index contours at its boundaries would be expected to slope inward. The ISEE observations of multiple spectral components, which are attributed to separate oscillations at different altitudes in the same enhancement, indicate a source thickness as small as 25 km and an internal wave growth threshold of roughly 40 dB, rather than the 70-120 dB previously believed necessary to account for auroral kilometric radiation without feedback. What is considered more significant is that the feedback model accounts for numerous aspects of the auroral kilometric radiation behavior, predicts emission at the wave growth saturation level, and leads to the conclusion that auroral kilometric radiation originates at many compact sites, each emitting a nearly monochromatic wave.
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