Discrete VLF emissions (7-9 kHz) displaying unusual banded and periodic structure

Details Discrete VLF emissions (7-9 kHz) displaying unusual banded and periodic structure Discrete VLF emissions (7-9 kHz) displaying unusual banded and periodic structure

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31..537f&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 31, May 1983, p. 537-539, 541-543, 545-551 (5 ff). Research supported by the

Mathematics

Logic

2

Atmospheric Radiation, Earth Magnetosphere, Very Low Frequencies, Computer Programs, Cyclotron Resonance, Magnetic Storms, Magnetospheric Electron Density, Periodic Variations, Whistlers

Scientific paper

The VLF goniometer receiver at Halley, Antarctica, has recorded rising frequency VLF emissions between 14.55 and 15.30 UT on June 28, 1972 having unusually high frequency and exhibiting banded structure. The risers were split into 6.0-7.7 kHz and 7.8-9.4 kHz frequency groups, of which the former were more numerous. The banded, satellite-observed emissions are suggested to be produced through partial suppression by magnetospheric line radiation propagating in the same duct. The risers are interpreted as being generated by cyclotron resonance with counterstreaming electrons, and the generation region and electron energies involved are determined by means of a computer program based on the Helliwell (1967) phenomenological theory. The 4-min periodicity in occurrence displayed by both frequency groups is consistent with that required to replenish the resonant electron flux by eastward drift into the duct.

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