Apparent ionospheric motion in the night-time D-region

Details Apparent ionospheric motion in the night-time D-region Apparent ionospheric motion in the night-time D-region

Jun 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..451s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 6, pp. 451-465

Physics

Scientific paper

Measurements of apparent motions of ionospheric irregularities in the D-region of the night-time ionosphere have been made using pulse radio reflections at 60 kc/s frequency. Amplitude measurements at three receivers, at the vertices of an equilateral triangle of side 3 km, were analysed by the Briggs-Phillips-Shinn correlation technique. An intensive study of observations, during the month of October 1958, showed the importance of random sampling effects in interpreting ionospheric drift data, particularly at the lower frequencies. Allowing for these effects, apparent motions (of the reflected pattern) about 30 m/sec were found, consisting of a prevailing drift motion, mainly toward the East, together with a randomly directed motion of about equal magnitude. Random changes in the pattern were found to be the principal cause of the amplitude fluctuation. The amplitude pattern at the ground was found to be slightly anisotropic, the mean behaviour being representable by an ellipse, axial ratio 1.3, with its major axis in the NW-SE direction.

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