Spread-F and the parameters of the F-layer of the ionosphere--I0

Details Spread-F and the parameters of the F-layer of the ionosphere--I0 Spread-F and the parameters of the F-layer of the ionosphere--I0

Nov 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..871s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 11, pp. 871-884

Physics

1

Scientific paper

An analysis has been made of spread-F data obtained from I.G.Y. [latin small letter f with hook]-plots for several ionosonde stations grouped about longitude 75°W, to establish whether there is any connexion between the incidence of spread-F and [latin small letter f with hook]0F2, F-layer electron content and semi-thickness. It is found that the percentage occurrence of the frequency-spreading component of spread-F at a value of [latin small letter f with hook]0F2 increases as 1/[latin small letter f with hook]0F2 for all seasons and latitudes. This relationship is shown to be independent of such associations as might exist between each of the two quantities involved and either the state of disturbance of the earth's magnetic field or the time of day. There seems to be no association between the incidence of frequency-spreading and the rate of change of [latin small letter f with hook]0F2, nor is there any association with the electron content of the F-layer. However, frequency-spreading is more likely to occur when the rate of change of electron content is positive and to a lesser extent negative, at least at equatorial latitudes. At these latitudes, there is a tendency for the incidence of frequency-spreading to decrease with increasing semi-thickness up to about 100-150 km. This tendency then reverses, the incidence increasing with increasing thickness above about 200 km. Discussion of these results is postponed to a later paper in the series.

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