The correlation properties of syncrotron radiation are analyzed in the classical approximation with allowance for the random radial structure of the electron bunch and its relativistic and extended nature. It Is. shown that the classical treatment has limited validity for description of the coherence of hard X-radiation from a synchrotron source. The energy parameters of dynamic scattering (DS) of partially coherent Xray beams In perfect crystals are calculated. The effects of Imperfect coherence on extinction beats and the anomalous passage of waves under DS conditions are analyzed. The increase in the radius of coherent radiation due to the interference nature of DS is calculated. A method for measuring the coherence radius in the X-ray band with use of DS effects is discussed.
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