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By P. M. Banks and G. Kockarts (Auth.)

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1 showing, for steps of 1 km, pressure, density, and total concentrations. 38 3 Physical Conditions of the Homosphere 90° S JANUARY 1. 90eNjuLYi. 0 LATITUDE JANUARY1. 9 0 ° N JULYI. 90 e S Fig. 2 Latitudinal temperature-height cross section; January or July [12]. A number of atmospheric models have been published which exhibit important differences. This arises from the fact that the computations have not been made in the same way and that time variations exist in the stratosphere and mésosphère as in the troposphere.

For a complete understanding of the behavior of the noble gases it would be necessary to study the atmospheric effects from the troposphere up to the thermosphère. REFERENCES 1. E. Glückauf, in Compendium of Meteorology (T. F. ), pp. 3-10. Amer. Meteorolog. S o c , Boston, Massachusetts, 1951. 2. A. G. W. Cameron, in The Origin and Evolution of the Atmosphere and Oceans (P. J. Brancazio and A. G. W. ), p. 235. Wiley, New York, 1964. 3. A. G. W. Cameron, in Origin and Distribution of the Elements (L.

These values, which will also be useful for discussions of various aeronomic problems, must be considered only as first approximations to the true values. 3 Lower Thermosphère When the number of oxygen atoms becomes sufficiently large compared with the number of oxygen molecules, the simple aspect of the homosphere disappears. The theoretical analysis of Chapter 4 shows that the lifetime or the recombination time of an oxygen atom increases rapidly between 85 and 100 km. Specifically, a concentration of the order of 1013 oxygen atoms cm -3 , equivalent to the total number of oxygen molecules dissociated by solar radiation in 1 sec, would have a mean lifetime of about 10 days at 95 km.

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