Oscillations of stellar extinction caused by disturbances in the earth's atmosphere

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Atmospheric Attenuation, Atmospheric Scattering, Atmospheric Turbulence, Earth Atmosphere, Brightness, Buoyancy, Fourier Transformation, Gravity Waves, Oscillations

Scientific paper

Photometry of bright stars has revealed the possible presence of short period oscillations on the extinction by the earth's atmosphere. From the colour dependence of the observed effects, it is suggested that the waves affect the aerosol contribution to the extinction more than the contribution by air molecules. The size of the effects presents a challenge to pursuing stellar photometry to accuracies of the order of 0.001 mag. The effects have parallels to the recently discovered brightness oscillations in the daytime sky which have been ascribed to buoyancy or gravity waves in the atmosphere.

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