Neutral air turbulence during DYANA - First results

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Atmospheric Turbulence, Diffusion Coefficient, Mesosphere, Rocket-Borne Instruments, Temperature Profiles, Middle Atmosphere, Optical Radar, Root-Mean-Square Errors

Scientific paper

During the DYANA campaign in early 1990 neutral air turbulence was measured by an improved version of a rocket borne instrument at high and middle latitudes. A first preliminary analysis of the flights shows that at both latitudes typical small scale (1 km - 1 m) density fluctuations are less than 0.1 - 0.2 percent in the entire mesosphere, apart from single altitude bins where values up to 1 percent were observed. The overall turbulent activity is thus significantly less than what has been observed at high latitudes in winter. This result is in agreement with the model from Garcia and Solomon. The temperature profiles and scale heights needed to convert small scale density fluctuations to turbulent parameters (e.g., eddy diffusion coefficients) were obtained from passive falling sphere measurements. An intercomparison of temperature profiles simultaneously measured by falling sphere and sodium LIDAR shows excellent agreement.

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