Measurements of molecular oxygen from 68 to 154 km using rocket-borne ultraviolet photometers are described. During summer, diurnal variations are found in the altitude range 93–104 km between dawn and daytime, the dawn concentrations being less by a fractional change in the average concentration of about 33%. Concentrations above 114 km in the spring agree with other measurements, but show rather large deviations from the CIRA 1965 mean atmosphere. Seasonal differences, observed below 90 km, generally support the variations observed in the total neutral atmosphere by other techniques.
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Weeks et al. (1968) studied this question.
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