Mesospheric observations with the EISCAT UHF radar during polar cap absorption events. I - Electron densities and negative ions

Details Mesospheric observations with the EISCAT UHF radar during polar cap absorption events. I - Electron densities and negative ions Mesospheric observations with the EISCAT UHF radar during polar cap absorption events. I - Electron densities and negative ions

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..809c&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, Dec. 1990, p. 809-824.

Physics

11

Eiscat Radar System (Europe), Ionospheric Electron Density, Mesosphere, Negative Ions, Polar Caps, Energetic Particles, Particle Precipitation, Proton Energy, Ultrahigh Frequencies

Scientific paper

Observations of mesospheric electron density were obtained by the EISCAT UHF radar during several polar cap absorption events (PCAs) in 1989. Both the latitudinal extent and the detailed vertical distribution of the excess ionization were determined. Continuous observations over more than two days during one event allowed an investigation of the variations in electron density during four twilight intervals. It is shown that, at sunrise, at heights above 70 km, electrons are released by ultraviolet photodetachment of a high-affinity negative ion, which may be NO3. Below 66 km altitude, the increase of electron density is delayed by about 30 min, indicating that the time taken for neutral oxygen species to build up is a controlling factor in producing the free electrons at these heights. Both these processes are operative between 66 and 70 km altitude. Nighttime profiles of the ratio of negative ion number density to electron number density are deduced, and empirical relationships of electron concentration at heights between 60 and 70 km are determined as a function of simultaneously observed proton flux.

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