Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811657r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,657-11,670.
Physics
53
Auroral Zones, In Situ Measurement, Kilometric Waves, Remote Sensing, Viking Spacecraft, Electrostatic Probes, Plasma Diagnostics, Wave Propagation
Scientific paper
A summary of investigations carried out from Viking measurements on the propagation and the generation of the auroral kilometric radiation (AKR) is presented. The hypothesis that low-amplitude Z and O modes are generated at the same time as a larger-amplitude X mode is confirmed. Hence Z-, O-, and X-mode AKR is all generated by the same sources. About 50 AKR source crossings are used to demonstrate that f(peak) approaches f(ce), the electron gyrofrequency: (f(peak)-f(ce))/f(ce) is about 0.025 in AKR sources. It is shown that an AKR source coincides with a strong depletion in the density of the cold/cool electrons that becomes comparable to or less than the density of energetic electrons (E is not less than 1 keV). AKR sources are found to coincide also with an acceleration region characterized by a potential drop of not less than 1 kV, both below and above the spacecraft.
André Martial
Bahnsen Axel
de Feraudy Herve
Hilgers Alain
Jespersen Mogens
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