Physics
Scientific paper
Nov 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964jatp...26.1055s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 26, no. 11, pp. 1055-1068
Physics
2
Scientific paper
Both the half-layer-thickness Ym of a parabolic approximation to the F2-layer peak and its height hm were deduced from ionograms taken at Lindau. Undisturbed intervals around noon and midnight for the December months of the years 1953-1960 were selected. The hm-as well as the Ym-data show strong dependency on the Zürich sunspot number R. It is shown analytically that this relation can be interpreted by a reasonable temperature variation at the F-layer peak during the respective sunspot cycle. The calculations themselves assume that ion production by solar radiation, electron losses by a two-stage process consisting of an ion-atom interchange reaction and a dissociative recombination and ambi-polar diffusion are the main processes responsible for the height and especially the shape of the F-layer peak, e.g. Ym. The results are: during sunspot minimum T = 1000°K (hm = 200 km) at noon and 900°K (hm = 300 km) at midnight; during sunspot maximum T = 1350°K (hm = 340 km) at noon and 1250°K (hm = 480 km) at midnight.
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