The scintillations of stars observed through the Earth's atmosphere are generated by random irregularities of air density. We propose the qualitative theory for description of coherency and correlations of optical scintillations measured at two wavelengths. It is based on a two-component model of air density irregularities: One of the components corresponds to anisotropic irregularities, while the second one is generated by locally isotropic turbulence. The main conclusion of the developed theory is that …
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