The nocturnal intermediate layer over South Georgia : solar and magnetic influence on occurrence

Broom, S.M; Rodger, Alan S.. 1982 The nocturnal intermediate layer over South Georgia : solar and magnetic influence on occurrence. Journal of Atmospheric and Terrestrial Physics, 44 (8). 713-717. 10.1016/0021-9169(82)90133-7

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Official URL: http://dx.doi.org/10.1016/0021-9169(82)90133-7

Abstract/Summary

Ionograms from South Georgia (54°S, 37°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 behaviour 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× 10−22 Wm−2Hz−1)inthediurnal 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 semi-diurnal tide. Some possible causes for the post-midnight observations are considered, but no firm conclusions can be made.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/0021-9169(82)90133-7
ISSN:	00219169
Date made live:	16 Jul 2019 10:37 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/524310

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1016/0021-9169(82)90133-7

ISSN:

00219169

Date made live:

16 Jul 2019 10:37 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/524310