Observations of electron cyclotron harmonic emissions associated with field-aligned electron beams

Details Observations of electron cyclotron harmonic emissions associated with field-aligned electron beams Observations of electron cyclotron harmonic emissions associated with field-aligned electron beams

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.7531k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 1, 1987, p. 7531-7537.

Physics

3

Cyclotron Radiation, Earth Magnetosphere, Electron Beams, Electrostatic Waves, Harmonic Radiation, Electron Density (Concentration), Electron Energy, Plasma Waves, Scatha Satellite, Very Low Frequencies

Scientific paper

Several cases have been found in plasma wave and electron distribution function data from the SCATHA satellite in which strong gyrofrequency emissions near 1.5 times the local electron gyrofrequency f(c) correlate in time with field-aligned electron beams. The energy of the electron beams ranges from 100 to 800 eV. Before the beam appears the emissions are observed at a lower freqency, typically 1.1 to 1.2 times f(c). As the beam develops, the emissions rise in frequency and grow in amplitude. Above 2 keV the electrons had a normal loss-cone distribution. This loss cone deepened by a small amount when the beams appeared at lower energy. These observations were made near local midnight at L = 7.0-7.8 earth radii.

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