Physics
Scientific paper
Jun 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964jatp...26..657r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 26, no. 6, pp. 657-685
Physics
6
Scientific paper
A model of the quiet F2-layer at mid-latitudes is presented, which combines timedependent solutions of the F2-layer continuity equation in a static atmosphere (Rishbeth, 1963) with the time-varying atmospheric models of Harris and Priester (1962). The analysis makes use of the fact that the diurnal variations of the photoionization rate, and of the loss and diffusion coefficients, become relatively simple when considered in terms of fixed pressure-levels. The rates used for this model provide a good representation of the F2-layer, especially by day. Several published values of production and loss rates at 300 km, for different levels of solar activity, are compared and found to be reasonably consistent. However, these rates are regarded as being determined only to within a factor of two. Not all F2-layer phenomena can be explained by the model. Other processes may be important; in particular, there are difficulties in accounting for the behaviour of the F2-layer at night, and these may indicate that the layer is maintained by slow downward diffusion of exospheric ionization or by corpuscular ionization.
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