Physics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.7560j&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 1, 1987, p. 7560-7568.
Physics
12
Doppler Effect, Magnetic Field Configurations, Signal Transmission, Spectrum Analysis, Spin Reduction, Very Low Frequencies, Isis Satellites, Spectral Energy Distribution, Whistlers
Scientific paper
The spectra of broadened VLF signals from ground transmitters received on the spinning ISIS spacecraft have a characteristic temporal dependence when the long receiving dipoles pass close to parallel to the earth's magnetic field direction. Analyses are presented here which show that the wave vectors corresponding to broadened spectra are confined to a narrow range of azimuths about the magnetic field direction. The wave vectors are distributed through a range of polar angles with respect to the magnetic field direction, possibly as the result of scattering of the upcoming waves in the ionosphere below the spacecraft.
Bell Timothy F.
James Gordon H.
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