The auroral radiating plasma cavities

Details The auroral radiating plasma cavities The auroral radiating plasma cavities

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..237h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, Feb. 7, 1992, p. 237-240. Research supported by CNES.

Physics

52

Auroras, Electron Density Profiles, Electrostatic Probes, Kilometric Waves, Viking Spacecraft, Cyclotron Radiation, Energetic Particles, Photoelectrons, Plasma Density, Volt-Ampere Characteristics

Scientific paper

The electron density profile of the nightside high-latitude region has been determined from a geocentric distance 1.5 RE to 3 RE by the use of the Viking Langmuir probe. Inside this region, density depletions are observed. Most of them coincide with acceleration structure crossings. Generation of auroral kilometric radiation (AKR) is observed in the strongest depletions between 1.5 and 2.5 RE. A threshold on the ratio plasma to electron gyrofrequency for AKR generation to occur is estimated at 0.14. This is in good agreement with the cyclotron maser instability theory for AKR generation.

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