Physics
Scientific paper
Jan 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964jatp...26...91c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 26, no. 1, pp. 91-92, IN3-IN4, 93-112
Physics
5
Scientific paper
The results are given of an investigation of spread-F irregularities, using a backscatter radar operating on a frequency of 18 Mc/s. The irregularities are shown to occur in patches which extend over distances of up to 400 km in the E-W vertical plane. Seasonal and nocturnal variations in the occurrence of irregularities are given, and it is shown that variations in their height closely follow variations in the height of the F-layer. The drift velocity of patches of irregularities is shown to be of the order of 100 m/sec towards the east. The results of Doppler shift measurements are interpreted as indicating that the irregularities sometimes exhibit large vertical velocities. It is shown that the irregularities are anisometric in the E-W vertical plane, and appear to have a maximum scattering cross-section in the direction perpendicular to their direction of motion.
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