Physics
Scientific paper
Nov 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..937f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 11, pp. 937-947
Physics
Scientific paper
Normal incidence phase path records are often sufficiently continuous to indicate that the wave is reflected from a single specular point on the reflecting layer. During the day the records for both the E- and F-regions then show irregularities with a quasi-period of the order of 10 min, in addition to the daily variation. At night the behaviour is less regular, and there is not a clear distinction between short-period and daily variations. From a series of calculations, on model ionospheres consisting of a linear background and a Gaussian irregularity of varying thickness, intensity and height, it is concluded that the effect of an irregularity on the phase path tends to be greatest when the irregularity is close to the level of reflection. This is in agreement with observations of drifts using different frequencies and supports the use of the phase-screen model in interpreting ionospheric fading. It is shown that it is possible to estimate the intensity of irregularities close to the level of reflection from a knowledge of the deviations of the phase path and the mean rate of change of electron density with height. Intensities of the order of 2 per cent of the background are found for the E-region and for the lower part of the F-region during the day.
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