Outer scale of turbulence and its influence on fluctuations of optical waves
Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, Academician Zuev square 1, Tomsk, 634055, Russian Federation
On the basis of generalizations of numerous measurements and calculations, the influence of the low-frequency part of the atmospheric turbulence spectrum, directly adjacent to the inertial interval, on the statistical characteristics of fluctuations of optical waves propagating in the atmosphere is analyzed. The measured spectra of atmospheric turbulence are compared with isotropic models. It was found that in the surface layer of the atmosphere, the outer scale of turbulence turns out to depend not only on the height above the underlying surface, but also on the type of atmospheric stratification. The influence of the low-frequency part of the atmospheric turbulence spectrum on the phase fluctuations of optical waves during their propagation, both on horizontal paths and when passing obliquely through the entire atmosphere, is analyzed.