Computer Science – Numerical Analysis
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ang....32..243l&link_type=abstract
Annales de Geophysique, vol. 32, July-Sept. 1976, p. 243-255. Research supported by the University Grants Commission.
Computer Science
Numerical Analysis
Annual Variations, Atmospheric Composition, F 2 Region, Ionospheric Electron Density, Midlatitude Atmosphere, Plasma-Particle Interactions, Atmospheric Models, Diurnal Variations, Equations Of Motion, Neutral Particles, Numerical Analysis, Wind Effects
Scientific paper
The midday F2 layer critical frequencies are greater in winter than in summer. This phenomenon is particularly pronounced at the middle latitude stations of the Northern Hemisphere and this feature is referred to as the seasonal anomaly. The existence of this anomaly is known for a long time from the bottomside ionosonde measurements. Recent data obtained from Alouette I and other topside sounders have also confirmed the existence of this anomaly. Several different explanations of this anomaly have been put forward. At the same time arguments have been advanced disfavoring some of these explanations. In this paper the seasonal anomaly has been examined in the light of the neutral wind-plasma interaction and the composition changes. The computational results are given which show a preference for the composition changes as the cause of the seasonal anomaly.
Lumb H. M.
Setty S. G. K. C.
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