Physics
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ang....35....1f&link_type=abstract
Annales de Geophysique, vol. 35, Jan.-Mar. 1979, p. 1-9. Research supported by the Centre National de la Recherche Scientifique
Physics
Atmospheric Stratification, Equatorial Atmosphere, F Region, Ionograms, Magnetic Equator, Autocorrelation, Daytime, Equatorial Electrojet, Histograms, Irregularities, Sporadic E Layer, Wind Effects
Scientific paper
Rising, stratified irregularities observed in the daytime equatorial F region are considered. Ionograms taken at Sarh, Chad from May, 1969 to September, 1971 reveal five types of diurnal F2 peak layer density cycles, of which those types exhibiting a fast plasma density increase and a slow rise in the altitude of the F peak are associated with the rise of strata. The occurrence times of the three types of strata observed are found to be clearly modulated by the moon. Autocorrelation of the intervals between days of rising strata occurrence show a 14-day lunar oscillation, in addition to a 27-day peak associated with solar activity. The lunar and solar modulation can be explained by the formation mechanisms of ion velocity convergence by neutral drag at the node of a gravity wave, or Hall drift convergence at a lower boundary of the zonal wind altitude range. Metallic ions are considered responsible for the maintenance of strata below 160 km, and the upward velocity is considered due to the electrojet Hall drift.
Faynot J. M.
Vila P.
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