The nocturnal intermediate layer over South Georgia - Solar and magnetic influence on occurrence

Details The nocturnal intermediate layer over South Georgia - Solar and magnetic influence on occurrence The nocturnal intermediate layer over South Georgia - Solar and magnetic influence on occurrence

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..713b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, Aug. 1982, p. 713-717.

Computer Science

Sound

Ionospheric Sounding, Magnetic Effects, Night Sky, Nocturnal Variations, Solar Activity Effects, Atmospheric Stratification, Diurnal Variations, Georgia, Ionograms, Kp Index, Solar Terrestrial Interactions, Winter

Scientific paper

Ionograms from South Georgia (54 deg S, 37 deg W; L = 1.9) are used to investigate the influence of magnetic and solar activity upon the occurrence of the nocturnal intermediate layer. The diurnal variation in occurrence of this layer exhibits a peak at about 2000 LT and a subsidiary peak after midnight. It is shown that magnetic activity has no significant influence on the behavior before midnight, but is positively correlated with the size of the post-midnight peak. The effect of varying solar activity is to introduce a local time shift (42 min for a change in mean solar activity from 80 to 130 x 10 to the -22nd W per sq m per Hz) in the diurnal variation without otherwise changing the overall morphology of the layer significantly. Most of the features of the intermediate layer before midnight can be explained by a wind shear mechanism associated with the solar semidiurnal tide. Some possible causes for the post-midnight observations are considered, but no firm conclusions can be made.

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