The stability of plane Couette flow is studied by applying a finite two-dimensional disturbance to the basic laminar motion and following the timewise evolution of the quasi-steady flow and the disturbance. This is accomplished by combining a Meksyn–Stuart type method with a quasi-steady technique. Results show that plane Couette flow tends to slowly converge to a stable state for the Reynolds numbers and disturbance intensities studied. This is in disagreement with past investigations which were able to obtain nonlinear neutral stability curves.

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Different lidar systems are used to probe the atmosphere and these systems typically measure the backscattered return as a way of studying aerosol profiles. Some of the lidar systems have the additional capability of measuring the Doppler return from aerosols and molecules for use in determining wind profiles. Other lidar systems have been designed to detect the Raman scattering phenomenon as a way of studying the distributions of molecular species.

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