Computer Science – Sound
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978esasp.135..209w&link_type=abstract
In ESA European Sounding Rocket, Balloon and Related Res., with Emphasis on Expt. at High Latitudes p 209-214 (SEE N79-31637 2
Computer Science
Sound
Annual Variations, Anomalies, D Region, Radiation Absorption, Radio Waves, Auroras, Electron Density (Concentration), Graphs (Charts), Ionospheric Composition, Nitric Oxide, Transport Properties, Winter
Scientific paper
Progress towards resolving the winter anomaly in radio-wave absorption is reviewed. The anomaly, a local winter effect, is a D-region phenomenon showing strong latitude dependence. In the long term the effect shows a solar cycle variation, but no similar short-term solar control is evident. Three types of winter absorption day are recognized and are reconciled with increased enhancement of D-region electron concentrations. Certainly in the extreme case, and probably in all cases, the enhanced electron concentrations are due to increases in concentration of the minor constituent nitric oxide. Transport from auroral to middle latitudes in winter is inferred and it is suggested that a considerable modification of the D-region chemistry be made at the time.
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