Other
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.274..670c&link_type=abstract
Nature, vol. 274, Aug. 17, 1978, p. 670, 671.
Other
5
Aerosols, Atmospheric Scattering, Daytime, Diurnal Variations, Sky Brightness, Atmospheric Attenuation, Atmospheric Boundary Layer, Atmospheric Refraction, Luminous Intensity
Scientific paper
The paper reports the discovery of sky brightness oscillations which can be associated with atmospheric waves, perhaps on the aerosol boundary layer. The oscillations, observed during May 1976 and November 1977, have implications for experiments investigating solar diameter oscillations. The sky brightness oscillations were detected during May 1976 in measurements of brightness changes in the sun, and a subsequent Fourier analysis indicated that the period was 27 min with an amplitude stronger in the red channel than in the blue. Photometric observations in November 1977 showed that the magnitude of the brightness oscillation was slightly larger than 1% of the recorded signal. The form of the oscillations is very complex. Typically any observed waveform may persist for three to five cycles before being replaced by another of different form and frequency. Periods range from minutes to the order of an hour.
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