Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..567d&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 44, July 1982, p. 567-571.
Physics
4
Aeronomy, Annual Variations, D Region, Ionospheric Electron Density, Positive Ions, Solar Position, Summer, Winter
Scientific paper
Compilation of rocket measurements of the electron concentration N sub e in the upper D-region confirms the conclusion that summer N sub e values are lower than winter values and that there is strong day-to-day variability of N sub e in winter. The nature of seasonal and day-to-day variations is considered from the point of view of the effective recombination coefficient through variations of the ion composition. It is shown that there exists a strong seasonal variation of ratio of clustered to normal ions, this parameter being higher in summer than in winter at a fixed altitude. This fact leads to higher values of effective recombination coefficient in summer, and thus can be considered as the main reason for the regular seasonal variations in N sub e as well as the day-to-day changes. The positive ion composition of the upper D-region depends on meteorological parameters and consequently meteorological control of the D-region can be realized through the effective recombination coefficient.
Danilov Aleksei Dmitrievich
Simonov A. G.
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