Abstract
Electron densities were measured in the ionospheric D-region during the polar cap event of 16 February 1984, and have been compared with production rates computed from proton fluxes measured on the geosynchronous satellite GOES-5. Profiles of effective recombination rate were determined which show a general consistency with previous estimates but differ in detail. There is evidence for a progressive change of recombination coefficient as the event proceeds. Calculations of the radiowave absorption profile from the EISCAT data are compared with measurements f the total radio absorption using riometers, and serve to indicate the height and thickness of the absorption region in the PCA.
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