Wind profile and turbulent wind data obtained from photographic tracking of rocket released chemical clouds have been used to compute the thermal and momentum eddy diffusivities Kt and Km in the 90–110-km region. Exponential functions having a small increase with altitude provide a reasonable representation of the mean Kt and Km values. The ratio Km∶Kt, the turbulent Prandtl number, is found to be approximately constant with a value of about 3. The mean Kt at 100 km is about 180 m²/sec, in reasonable agreement with previous estimates. The exponential functions for Kt and Km are also used to obtain revised estimates of the energy balance parameters and the turbulence heating rate in this altitude range.
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C. G. Justus (1967) studied this question.
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