Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3...29t&link_type=abstract
Geophysical Research Letters, vol. 3, Jan. 1976, p. 29-32.
Physics
4
Atmospheric Radiation, Extremely Low Radio Frequencies, Hiss, Magnetic Storms, Satellite Observation, Cyclotron Resonance, Earth Magnetosphere, Electron Energy, Electron Flux Density, Explorer Satellites
Scientific paper
Satellite observations of medium energy electrons and ELF waves (100-1000 Hz) during a modest isolated substorm are analyzed. It is shown that the observations of the depletion of trapped electron flux near dawn at absorption coefficient (L) of about 5 and the simultaneous reduction of ELF emission intensity are consistent with the electron cyclotron resonant generation mechanism for plasmaspheric whistler mode waves. During the period studied, the wave source location appears to be restricted to L not less than 5 and the observed emission can realistically originate from cyclotron resonant instability with anisotropy electrons with energy comparable to 30 keV. The observed variation of trapped electron flux during the substorm period is tentatively explained as a modification of the electron drift orbits caused by increases in the large-scale magnetospheric convection electric field. It is unlikely that electrons with energy appreciably larger than 30 keV can participate in the cyclotron resonant instability mainly because their flux is always too low to produce significant wave growth.
Barfield J. N.
Mansergh Thorne Richard
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