Other
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1159c&link_type=abstract
Geophysical Research Letters, vol. 8, Nov. 1981, p. 1159-1162.
Other
17
Atmospheric Radiation, Auroral Zones, Kilometric Waves, Low Frequencies, Atmospheric Refraction, Cyclotron Radiation, International Sun Earth Explorer 1, Isis-A, Radiation Distribution, Satellite Orbits
Scientific paper
It is noted that certain of the ISEE-1 observations between the plasmasphere and the auroral zone have revealed the emission cone of auroral kilometric radiation (AKR) unaffected by plasmaspheric refraction. At some distance from the source, the cone produced a sharp low-frequency boundary in the AKR signals, which was displaced above the cyclotron frequency. The variation of this boundary, together with other aspects of the AKR signals, suggested that the AKR emission cone closed toward a hollow, roughly 45 deg limit cone with decreasing frequency, duplicating the behavior previously found with ISIS-1 at the opposite end of the AKR spectrum. It is pointed out that the hollow limit cone at low frequencies is a new feature, not previously reported.
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