Physics
Scientific paper
Nov 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..899s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 11, pp. 899-907
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 the frequency-spreading component of spread-F and the vertical movement of the F2-layer. It is found that at equatorial latitudes downward movement of the F2-layer is associated with the production of frequency-spreading. Upward movement inhibits the production of frequency-spreading at Huancayo and Talara. At latitudes above 60° geomagnetic, movement upwards or downwards results in increased frequency-spreading activity. Minimum, but not zero percentage occurrence is associated with a stationary layer at these latitudes. These low- and high-latitude associations between the incidence of frequency-spreading and the vertical movement of the F2-layer are found to be independent of magnetic activity, time of day, and season of the year. Discussion of these results is postponed to a later paper in the series.
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