The paper presents the first results of comparative study of the optical turbulence at the sites of the Fuxian Lake Solar Observatory (FSO) and the Baikal Astrophysical Observatory (BAO). The distributions of the probability of the Fried parameter estimated from Shack-Hartmann wavefront sensor measurements are analyzed.
We propose the concept of the new SCIDAR-based method to determine the characteristics of the atmospheric turbulent layers including its heights and strength. In this paper we discuss the possibility of the estimating of the heights of the atmospheric turbulent layers from the vertical profiles (along line of sight) of dimensionless characteristics of turbulence. The method is based on the analysis of the scintillation in crossed optical beams (with temporal lag) on the spaced subapertures of single Shack-Hartmann sensor (with field of view of order 40 arc.sec.) conjugated with the aperture.
One of the approach to calculate the characteristics of the air refractive index fluctuations along line of sight for multiconjugated adaptive optics is based on the triangulating the wavefront distortions or/and scintillation amplitudes analysis. The description of the experiments aimed to measurements of the wavefront distortions and scintillation fluctuations is given. The scheme for recovering the optical distortions (wavefront) at the different heights is discussed. The results of changes of the wavefront distortions measured by Shack-Hartmann sensor in the spaced regions of images are discussed. The results obtained may be used for estimation of the real amplitudes of the wavefront distortions in crossed optical beams at the different heights using such method as SDimm+[ 5].
The work discusses the optical turbulence structure and dynamics at the Baykal Astrophysical Observatory (BAO) site. The characteristics of the optical turbulence including Fried radius, isoplanatic angle are analyzed. Estimates of the variations of the height profiles of the air refraction index turbulent fluctuations at the Baykal Astrophysical Observatory are given. Using the mean height profile of the structure characteristic of the air refraction index turbulent fluctuations, diurnal variations of the Fried radius at the BAO site are estimated.
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