Physics – Optics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981optco..39..287a&link_type=abstract
Optics Communications, vol. 39, Nov. 1, 1981, p. 287-292.
Physics
Optics
12
Atmospheric Turbulence, Autocorrelation, Solar Atmosphere, Solar Granulation, Speckle Patterns, Temporal Distribution, Daytime, Diurnal Variations, Solar Observatories, Standard Deviation, Time Constant, Turbulence Effects, Turbulence Models
Scientific paper
A study of day-time temporal autocorrelation functions of speckles was performed on the solar granulation with the McMath telescope of the Kitt Peak National Observatory. In the space of only a few minutes, rapid variations of time constants are observed. For some observations, a single and high value T of time-constant is obtained: average equals 170 ms, standard deviation equals 80 ms. The temporal autocorrelation functions are consistent with theoretical curves obtained from a single layer atmospheric turbulence model. For other observations, a super-imposed short time-constant r, showing little variations around 5.5 ms (standard deviation 1 ms), is also present. It is shown that T depends on the diameter of the telescope D and that the value r of the short time scale, when it occurs, is correlated with the Fried parameter r(0).
Aime Claude
Kadiri Samir
Martin Francisco
Ricort Gilbert
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