The nocturnal intermediate layer over south Georgia

Details The nocturnal intermediate layer over south Georgia The nocturnal intermediate layer over south Georgia

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43.1043r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 43, Oct. 1981, p. 1043-1050.

Physics

9

Atmospheric Stratification, Interlayers, Ionospheric Disturbances, Midlatitude Atmosphere, Night Sky, Annual Variations, Diurnal Variations, E Region, F Region, Ionograms, Solar Terrestrial Interactions

Scientific paper

A nocturnal intermediate layer is frequently observed on ionograms from the southern mid-latitude station of south Georgia. The layer is frequently seen between the E and F regions in the height range 130-180 km, and is usually restricted to the winter months between the local hours of 1930 and 2300. A study of the intermediate layer phenology for 1976 and 1977 shows that there is a prior downward movement of the F-layer, followed by the formation of the intermediate layer, its subsequent drift downwards, and its stabilization between 150 and 130 km. The layer is thick at first (10-20 km), but gradually thins as it evolves. The intermediate layer also appears to be independent of the level of magnetic activity. Comparison of the south Georgia results with those from other localities indicates many similarities. It is shown that the main features of the diurnal and seasonal variations of occurrence can be explained by the theory of convergence of ionization driven by the solar semi-diurnal tidal winds; limitations of this mechanism are also discussed.

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