Physics
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..689g&link_type=abstract
Journal of Geophysical Research, vol. 83, Feb. 1, 1978, p. 689-696.
Physics
12
Atmospheric Radiation, Auroral Irradiation, Long Wave Radiation, Radio Auroras, Satellite Observation, Eccentric Orbits, Electron Radiation, Gyrofrequency, Hiss, Polar Orbits
Scientific paper
The initial results are presented from observations of auroral kilometric radiation at radial distances of about 2.0 R(E) over the auroral zone. These measurements provide important new evidence on the mode of propagation and origin of the auroral kilometric radiation. The observations were made with the aid of the Hawkeye 1 spacecraft which is in a highly eccentric polar orbit. The three types of high-frequency radio emissions commonly observed by Hawkeye 1 during the low-altitude passes over the southern hemisphere include continuum radiation, auroral kilometric radiation, and auroral hiss. In most cases it is found that the auroral kilometric radiation has a sharply defined low-altitude cutoff at the altitude where the local electron gyrofrequency is equal to the wave frequency. A few exceptional cases occur in which a low-frequency cutoff cannot be clearly identified.
Green James L.
Gurnett Donald A.
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