The auroral radiating plasma cavities

Journal Article · Fri Feb 07 00:00:00 EST 1992 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/91GL02938· OSTI ID:5439986

Hilgers, A ^[1]

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1. Swedish Inst. of Space Physics, Uppsala (Sweden)

The electron density profile of the nightside high latitude region has been determined from a geocentric distance 1.5 R{sub E} to 3 R{sub E} 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 R{sub E}. 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.

• OSTI ID: 5439986
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Vol. 19:3; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AURORAL ZONES
PLASMA DENSITY
RADIOWAVE RADIATION
ACCELERATION
COMPARATIVE EVALUATIONS
DISTANCE
ELECTRON DENSITY
ELECTRON PRECIPITATION
SATELLITES
CHARGED-PARTICLE PRECIPITATION
ELECTROMAGNETIC RADIATION
EVALUATION
RADIATIONS
661320* - Auroral
Ionospheric
& Magnetospheric Phenomena- (1992-)