Mathematics – Logic
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27.1293s&link_type=abstract
Planetary and Space Science, vol. 27, Oct. 1979, p. 1293-1295, 1297-1301.
Mathematics
Logic
F Region, Ionograms, Ionospheric Propagation, Radar Echoes, Geomagnetism, Ground Stations, Histograms, Statistical Correlation
Scientific paper
Observation of ionograms recorded at about fifteen high-latitude stations shows the same morphological types of F-lacunae (disappearance of echoes from the F1, the F2 or the complete F-layer) there as in Terre Adelie. The phenomenon is estival and diurnal everywhere, but the shape of occurrence histograms varies from one station to another. A statistical study shows that the occurrence at the various stations (of the same hemisphere) is correlated, all the more as the considered stations have similar invariant latitudes. Occurrence is correlated with the daily index of magnetic activity Ap, a correlation which is maximum at about 75 deg invariant latitude and decreases on both sides. A study of particular events shows a clear relation between lacuna occurrence and the position and motion of the cleft (as deduced empirically from the Kp index), results which can be interpreted in terms of a previously described model.
Cartron S.
Sylvain M.
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