Outer zone electron precipitation produced by a VLF transmitter

Details Outer zone electron precipitation produced by a VLF transmitter Outer zone electron precipitation produced by a VLF transmitter

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.1849v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, March 1, 1988, p. 1849-1858.

Computer Science

Sound

10

Electron Precipitation, Magnetospheric Electron Density, Outer Radiation Belt, Very Low Frequencies, Magnetospheric Instability, Satellite Sounding, Transmitters, Vlf Emission Recorders

Scientific paper

By means of high-resolution pitch angle measurements made by a magnetic-focusing electron spectrometer on the S3-3 satellite while in the drift loss cone region of the magnetosphere, characteristics of fluxes of 108- to 654-keV electrons precipitated in the inner zone, in the slot region, and in the outer zone of the magnetosphere are all shown to be consistent with the precipitation's having been produced by the same ground-based VLF transmitter, UMS. Pitch angle measurements are used to locate the longitude of precipitation. The temporal pattern of transmitter operation obtained from synoptic data from a ground-based VLF receiver is used along with drift rate calculations to predict the electron energies as a function of L shell which should be observable by the S3-3 instrument. The predicted energy response is then compared with the in situ observations, getting complete agreement. Finally, wave-particle resonance calculations are made for each of the three regions. The study indicates that ground-based VLF transmitters, which have previously been shown to produce precipitation in the inner zone and slot regions, are almost certainly instrumental in precipitating electrons in the outer zone also.

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