Abstract
The examination of photographs of a trail of sodium vapour laid by a Skylark rocket at latitude 31° S has led to the determination of the molecular diffusion coefficient for sodium at altitudes between about 110 and 140 km. The diffusion coefficients obtained are in general agreement with those found by Blamont and by Manring et al. by similar methods, but higher than those calculated from the 1959 A.R.D.C. Standard Atmosphere. Values of the atmospheric scale height and mass density for altitudes between 110 and 140 km are deduced.
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