Measurements of the vertical-path atmospheric modulation transfer function (MTF) have been completed at both desert and mountain locations for daytime and nighttime conditions. The average atmospheric MTF characterized by the parameter r<sub>0</sub> is found to be virtually identical, 34 mm, for both the desert and the mountain locations during the day, whereas a ratio of 1.7 is observed at night, 47 mm versus 82 mm, respectively. Relative peaks in r<sub>0</sub> for both the mountain and the desert sites corresponding to the daily air-surface temperature crossover periods are observed. By collecting data at both 2 and 8 m above the desert surface, the effects of tower height are investigated.

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Favier, D. L.

Fried, D. L.

Hines, J. R.

Hufnagel, R. E.

Kunkel, K. E.

Lutamirski, R. F.

Stanley, N. R.

Tatarski, V. I.

V. I. Tatarski, Wave Propagation in a Turbulent Medium (McGraw-Hill, New York, 1961), pp. 164–172.

Walters, D. L.

Yura, H. T.

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