Physics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..515p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, May 1987, p. 515-518. Research supported by the Swedish Board for Space
Physics
17
Auroral Zones, Electrostatic Waves, Hiss, Kilometric Waves, Broadband, Electron Beams, Electron Density (Concentration), Harmonics, Spectrograms, Wave Generation
Scientific paper
The source regions of Auroral Kilometric Radiation (AKR), as observed by the Viking satellite, are usually characterized by steep gradients of the thermal electron density. On the polar and equatorial edges of these thermal density depletions, very intense bursts of broadband electrostatic noise are detected in a frequency range extending from the low frequency cutoff of the high frequency wave receiver (10 kHz) up to the neighborhood of the local electron gyrofrequency. The intensity of these bursts is at least of the same order of magnitude as the maximum intensity of AKR, which takes place in the center of the cavity. A possible link between the presence of the electrostatic bursts and the AKR generation mechanisms is investigated.
Bahnsen Axel
Jespersen Mogens
Malingre Michel
Pottelette Raymond
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