Atmospheric turbulence and the apparent instantaneous diameter of the sun

Details Atmospheric turbulence and the apparent instantaneous diameter of the sun Atmospheric turbulence and the apparent instantaneous diameter of the sun

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59l..27k&link_type=abstract

Astronomy and Astrophysics, vol. 59, no. 2, July 1977, p. L27-L30.

Physics

Optics

13

Astrometry, Atmospheric Turbulence, Size Determination, Sun, Turbulence Effects, Atmospheric Optics, Diameters, Dimensional Analysis, Error Analysis, Meteorological Parameters, Perturbation Theory, Power Spectra, Solar Instruments

Scientific paper

Astrometric data are perturbed by turbulent density fluctuations in the atmosphere over the frequency range from 0.0001 to 10 Hz by amounts that would limit the accuracy of solar-diameter measures significantly. Power spectra of the perturbations are compared with meteorological data to argue that thermal turbulence is dominant above 0.001 Hz and that mechanical turbulence (weather) is important below that frequency. Noise power in astrometry should be comparable under night or day conditions, but site location may be important for the strength of slowly passing waves.

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