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Scintillation index calculations using an altitude-dependent structure constant.

We present calculations of the scintillation index that result from a plane wave of light impinging on the atmosphere. Calculations are made using the two-scale theory and assuming a Kolmogorov structure function with an altitude-dependent structure constant. A plot of the scintillation index for typical nighttime viewing is given as a function of angle from the zenith. A further approximation is then introduced which allows the calculation of the scintillation index in terms of a single nondimensional parameter. This parameter is a direct generalization of the parameter used when the structure constant is an absolute constant.