Shortcomings in our understanding of the lower ionosphere as revealed by an analysis of radiowave absorption measurements

Details Shortcomings in our understanding of the lower ionosphere as revealed by an analysis of radiowave absorption measurements Shortcomings in our understanding of the lower ionosphere as revealed by an analysis of radiowave absorption measurements

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..629g&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, June 1978, p. 629-642.

Physics

3

Atmospheric Chemistry, Electromagnetic Absorption, Ionospheric Electron Density, Lower Ionosphere, Radio Transmission, D Region, Diurnal Variations, E Region, Electron Density Profiles, Electron Recombination, Equatorial Atmosphere, Ion Production Rates, Nitric Oxide, Reaction Kinetics, Solar X-Rays

Scientific paper

The present knowledge of ion production and loss processes in the D- and lower E-regions is evaluated with reference to a series of equatorial ground-based radiowave absorption measurements. An equatorial noontime reference electron density profile, corresponding to a nonflaring sun at solar cycle maximum, is derived on the basis of multifrequency absorption and virtual height measurements and data from a rocket-borne investigation. It is found that the Meira (1971) nitric oxide profile does not agree with the Gnanalingan (1974) empirical expression relating absorption to solar flux. Meira's densities below 90 km must be reduced by a factor of about 5 in order to correspond. A wide disparity is observed between the effective recombination coefficient and the average dissociative recombination coefficient for the known ion composition in the lower ionosphere. A study of diurnal variations of radiowave absorption and virtual height shows a great disagreement between calculated and measured values.

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