Application of the Ramfjordmoen partial reflection experiment to the study of auroral precipitation events

Details Application of the Ramfjordmoen partial reflection experiment to the study of auroral precipitation events Application of the Ramfjordmoen partial reflection experiment to the study of auroral precipitation events

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43.1093h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 43, Oct. 1981, p.1093-1106. Research supported by the Science Research Cou

Physics

3

Auroral Absorption, Auroral Echoes, Electron Density Profiles, Electron Precipitation, Radio Echoes, Auroral Ionization, Energetic Particles, Energy Spectra, Riometers

Scientific paper

The application of the partial reflection technique to the study of auroral radio absorption events is investigated. It is demonstrated that the technique measures the radio absorption due to the most energetic of the precipitated electrons, accounting for no more than a few percent of the total radio absorption as measured with a riometer, but usefully indicating the effective upper limit of the energy spectrum and the lowest altitudes affected by events at different times of day. The characteristic signature of the short-lived spike event is described. It is shown that the echoing regions are persisting structures of the neutral atmosphere, which produce partial radio reflections when they are 'illuminated' from time to time by a sufficient flux of ionizing particles. Thus, the echo height tends to step between discrete levels as the event develops or decays, though at times there are more gradual vertical movements suggesting wavelike notions.

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