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By Julian Heicklen (Auth.)

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At night there is no pertubation term and the steady-state approximation will hold for even longer lifetimes ~ 1 0 4 sec. Regardless of the lifetime, the steady-state approximation holds if the concentration is passing through a maximum or minimum. There is another useful application of the steady-state hypothesis that applies when r{X} is very much greater than the pertubation time if the pertubation is cyclic. In the atmosphere the solar radiation intensity cycles on a 24-hr time scale (not exactly cyclic because due to change of 54 II.

113, 475, "The Physical Theory of Meteors. I. " Cumming, C , and Lowe, R. P. (1973). J. Geophys. Res. " De Jonckheere, C. , and Miller, D. E. (1974). Planet. Space Sei. " Dickinson, P. H. , Bolden, R. C , and Young, R. A. (1974). " Ditchburn, R. , and Young, P. A. (1962). J. Atmos. Terrest. Phys. " Donahue, T. , and Thomas, R. J. (1973). J. Geophys. Res. " Ehhalt, D. , and Heidt, L. E. (1973a). "Vertical Profiles of Molecular H 2 and CH 4 in the Stratosphere," presented at AIAA/AMS Int. Conf. Environ.

9 ) ppm at 40-50 km. We conclude that the average value for H 2 0 vapor concentrations at midlatitudes are 2 db 1 ppm, 15-20 km; 3 db 1 ppm, 20-30 km; 5 db 1 ppm, 45 km. Carbon Compounds In the flights described above, Ehhalt and Heidt (1973a) also collected CH 4 . They combined these data with the earlier data of Bainbridge and Heidt (1966) and Ehhalt et al. 25 ppm at 50 km. Ehhalt et al. 6 km at 31° north latitude in May 1973. Ehhalt and Heidt (1973b) also made measurements from 0 to 8 km over Santa Barbara, California, and Scottsbluff, Nebraska.

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