Optical evidence of the lunar atmospheric tide

Details Optical evidence of the lunar atmospheric tide Optical evidence of the lunar atmospheric tide

Dec 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24.1065b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 12, pp. 1065-1071

Physics

2

Scientific paper

The results of photometric observations of twilight sky radiance made by at Halsingborg, Sweden (1946-1948), and by the author at Sidmouth, England (1948-1953: 1958-1960), reveal a systematic fluctuation of twilight intensity with lunar age, at constant solar depression. To explain this dependence, an influence of the lunar atmospheric tide on the optical scattering properties of the high atmosphere is postulated. Harmonic analysis of the Halsingborg data reveals two major periodicities of 14.75, and 29.5 days respectively, the former resulting from a lunar semi-diurnal tidal component, From this analytical data, amplitudes and phases of both tidal oscillations are computed for a series of optical sounding heights lying between 14.5 and 138 km. Both components have zero amplitude at 32 ± 4 km. Since the tidal oscillations can cause cyclic changes in sky brightness of up to [small tilde]30 per cent of the mean brightness level, the necessity of recognizing, and correcting for, the lunar effect in certain typos of photometric, and spectrophotometric work is emphasized.

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