Physics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6477d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6477-6491. Research supported by Lockheed Independent
Physics
14
Cyclotron Resonance, Earth Magnetosphere, Electron Precipitation, High Energy Electrons, Eastern Hemisphere, Electron Spectroscopy, Energy Spectra, Pitch (Inclination), Radio Transmitters, Satellite Instruments, Solar Rotation, Spectrometers, Very Low Frequencies, Western Hemisphere
Scientific paper
Cyclotron resonance between trapped energetic electrons and VLF waves produces pitch angle scattering which leads to electron precipitation in the inner magnetosphere. Previous experiments have shown that in the drift loss cone at L values from 1.5 to 1.8 the energy spectrum of the electrons above 50 keV is often dominated by a single narrow peak. The center energy of this peak varies with L in a manner characteristic of cyclotron resonance between the electrons and monochromatic VLF waves in the vicinity of the geomagnetic equator. The source of the waves is probably VLF communication or navigation transmitters. Reported here are the results of a study of 680 occurrences of these peaks detected by the low altitude polar orbiting satellite S81-1. The present data, from altitudes between 170 and 270 km, show the resonance peaks only in two restricted longitude zones centered at 110 deg E and 300 deg E; this result contrasts with the previous measurements at higher altitudes, which detected peaks over a wide range of longitudes.
Datlowe Dayton W.
Imhof William L.
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