Physics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..783h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 42, Sept.-Oct. 1980, p. 783-789.
Physics
20
Auroral Absorption, D Region, Incoherent Scatter Radar, Ionospheric Electron Density, Precipitation Particle Measurement, Radar Scattering, Energy Spectra, Radar Measurement, Time Response
Scientific paper
Electron density profiles in the night-time auroral ionosphere were obtained with the incoherent-scatter radar at Chatanika, Alaska, during short duration precipitation events characterized by riometer data as spike events. The measurements show exceptionally large electron densities in the D-region during spike events, the electron density exceeding one million cu cm at 90 km altitude for a short time. It is shown that 20-40 keV electrons make the greatest contribution to an absorption spike and that the spectrum of electrons producing it is probably softer than that resulting in more slowly varying absorption peak; these absorption layers are too high to be measured by the technique of multifrequency riometry.
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