Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113732m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13732-13738.
Physics
22
Harmonic Radiation, Kilometric Waves, Radio Auroras, Satellite Observation, Plasma Waves, Satellite-Borne Instruments
Scientific paper
The plasma wave instrument on board the DE 1 spacecraft has observed several intervals of auroral kilometric radiation during which harmonic structure is clearly present. The paper presents evidence, some of which is based on unique capabilities of the DE instrument, which argues strongly that the harmonic structures are natural rather than instrumental in origin. The harmonic emissions occur infrequently, but when present may persist for intervals of up to an hour. The emissions are relatively narrow band and consist of a relatively weak fundamental accompanied by an even weaker second harmonic. The ratio of power in the fundamental band to the power in the harmonic ranges from 10 to 100. In all cases, polarization data indicate that the fundamental is a left-hand ordinary (L-O) mode emission while the harmonic is right-hand extraordinary (R-X) mode. These observations are consistent with predictions based on the cyclotron maser mechanism.
Gurnett Donald A.
Huff Richard L.
Mellott Mary M.
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