Physics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975georl...2..281k&link_type=abstract
Geophysical Research Letters, vol. 2, July 1975, p. 281-283
Physics
2
Earth Magnetosphere, Electromagnetic Interactions, Propagation Modes, Proton Precipitation, Very Low Frequencies, Whistlers, Electromagnetic Pulses, Electron Flux Density, Elementary Particle Interactions, Satellite Observation, Time Dependence, Time Lag, Wave Propagation
Scientific paper
Results are reported for a series of wave-particle interaction experiments in which VLF waves were transmitted into the magnetosphere from a site near Anchorage, Alaska, and protons with energies between 50 and 530 keV were detected by sensors aboard satellite 1972-76B at an altitude of 700 km in a region conjugate to the transmitter. A diffusion-equilibrium model was chosen for the plasmasphere, and the VLF waves were assumed to be unducted whistler-mode waves which interact with protons at the equator through either a Doppler-shifted cyclotron resonance or a traveling-wave-tube resonance. Temporal maxima in the proton count rates were identified on a one-to-one basis with short pulsed transmissions from the VLF transmitter. The observed time lag between the center of a transmitted pulse and detection of the next maximum in proton count rate was found to agree well with the delay predicted from the plasmaspheric model.
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