Direct observation of radiation belt electrons precipitated by the controlled injection of VLF signals from a ground-based transmitter

Details Direct observation of radiation belt electrons precipitated by the controlled injection of VLF signals from a ground-based transmitter Direct observation of radiation belt electrons precipitated by the controlled injection of VLF signals from a ground-based transmitter

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..361i&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, April 1983, p. 361-364.

Physics

64

Beam Injection, Electron Precipitation, Radiation Belts, Vlf Emission Recorders, Electron Energy, Energy Spectra, Stimulated Emission, Very Low Frequencies

Scientific paper

Observations are presented of radiation belt electrons precipitated by controlled injection of VLF signals from a ground based transmitter. The observations were conducted as part of the Stimulated Emission of Energetic Particles (SEEP) experiment during May-December 1982. The controlled modulation of VLF transmitters and a sensitive low altitude satellite payload to detect the precipitation were key elements of SEEP. Elecron counting rate time profiles measured during a coordinated satellite-transmitter operation are presented and compared with the programmed modulation patterns of the VLF transmitter. The observed energy spectra are interpreted in terms of energy selective precipitation mechanisms occurring in the near equatorial regions. The measured energy spectra during these observations showed that approximately 15-50 percent of the enhanced electron flux was concentrated near the resonant energies for first order cyclotron interactions occurring close to the magnetic equator with the nearly monochromatic waves emitted from the transmitter.

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