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*F*{

*n*(r),E(r). Here

*n*is the refractive index and

*F*is a known function. The equation can be solved by the method of successive approximations. We used only the first approximation. We supposed that permeability is equal to unity. A function describing the dependence of the refractive index on coordinates was selected. An example of the calculation is given in the paper. The solution may be generalized to the case when the refractive index depends on time.

_{2}=

*const*). The value of the component is linearly dependent on x

_{1}along the curves.

A procedure was set forth which allows to solve the problem when the beam propagates through the inhomogeneous gas. If the permittivity is close to unity and the permeability is equal to unity we get the explicit solution. The obtained solution may be generalized to the case when the permittivity depends on time.

_{3}= 0 ( x

_{3}being the coordinate along the axis of the beam). In the second case (the permittivity is the function of coordinates being close to unity) we have a system of linear ordinary differential equations after the Fourier transform, too. The right-hand terms depend on the previous solution which was obtained for the homogeneous atmosphere. The solution is the sum of that one for the homogeneous atmosphere and that one for the variable part of the permittivity. Thus we have the solution which describes the propagation of the non-paraxial beam through the inhomogeneous atmosphere on condition that the variation of the refractive index is small. Numerical calculations were fulfilled for the components of the electric field.

_{sc}, open-circuit voltage, V

_{oc}and fillfactor) obtained in the temperature range from 25°C to 50°C and also at a beam power, P, of up to 100 Suns are discussed.

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