Physics
Scientific paper
Mar 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29..225r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 3, pp. 225-238
Physics
20
Scientific paper
An approximate method is developed for computing the theoretical diurnal variation of the peak electron density, NmF2, in the midlatitude ionosphere. It is based on the principle that the height of the F2-peak is determined by a balance between loss and plasma diffusion, this balance being modified by vertical drift. The method enables the effect of time-varying drifts on NmF2 to be estimated. To verify the method, examples with zero drift are computed and yield curves of NmF2 very similar to those given by more accurate methods. The effect on NmF2 of thermally-driven winds, computed by Geislee (1966), is then studied. The winds appropriate to sunspot maximum cause a depression of NmF2 around midday in summer, such as is often observed, but do not account for the seasonal anomaly in NmF2. The winds appropriate to sunspot minimum are stronger, and produce effects which seem unreasonably large, At night, the winds can probably account for the maintenance of the F2-layer in summer, and perhaps in winter also. More accurate calculations are required to establish this, since it depends on the detailed behaviour of the winds near sunset. The winds are probably responsible for the day-to-night changes of the height of the peak, hmF2, observed in midlatitudes.
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