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551.510We study the influence of the vertical advection on the behavior of the mesospheric photochemical system (altitudes from 80 to 90 km), which is initially in the regime of a nonlinear (subharmonic) response to diurnal variations in solar radiation. It is shown that allowance for the atmospheric transport significantly modifies the nonlinear dynamic properties of this system and, depending on the value and speed direction of the mean vertical wind, can lead to either a suppression of nonlinear oscillations of the minor gas constituents of the upper mesosphere or an increased complexity of their behavior under the actual atmospheric conditions.

For 3d waveguiding system calculations we used the Electric Field Integral Equation (EFIE) model, applied to infinitely thin, perfectly conducting waveguide surfaces. The solution represents induced current, from which the field in the device is obtained. With the help of this method an asymmetric mode converter TE01-TE11 was simulated and optimized for maximum efficiency. We have also studied a helically corrugated structure, which is used in pulse compressors, and analyzed the structures dispersion curves and compared it with measurement results.