Physics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.1687a&link_type=abstract
Journal of Geophysical Research, vol. 85, Apr. 1, 1980, p. 1687-1694.
Physics
Atmospheric Electricity, Electric Fields, Equatorial Atmosphere, Power Spectra, Doppler Effect, Night Sky, Signal Reception, Whistlers
Scientific paper
Records of the Doppler shift of signals from a VLF transmitter received in the whistler mode are converted to fluctuation electric fields in the equatorial plane at L = 2.3 and presented as power spectral densities. The 200 hours of data examined show a two-order of magnitude variation in the power level as magnetic activity rises, though there is a considerable range of values at a given level of activity. Median values are an order of magnitude below the levels found by balloon extrapolations at what were generally higher latitudes. Simultaneous whistler-mode records of azimuthal electric field at longitudes spaced by about 7 hours show such correlations that the electric fields near a 1-hour period must be composed mainly of low-order spatial modes. With this assumption, a diffusion coefficient at L = 2.3 for radially diffusing particles is calculated which shows that at energies up to approximately 0.5 MeV, electrostatic diffusion must be very important.
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