The concept of isoplanatism is considered as applied to problems of adaptive correction of atmospheric distortions. Wave aberrations presented in the form of series expansion in terms of Zernike polynomials are used to calculate the angular correlation of modal components of phase fluctuations of optical radiation propagating in the turbulent atmosphere. The size of the isoplanatic area in an adaptive optical system is determined. The influence of the model of vertical profile of the structure parameter of atmospheric refractive index fluctuations, the outer scale of atmospheric turbulence, and the size of receiving aperture of a telescopic system are analyzed.
isoplanatism, adaptive correction of atmospheric distortions, wave aberrations