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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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Four different rocket techniques provided data on ozone at Wallops Island, Virginia, during the Aladdin 74 program. The entire altitude region from 19 to 108 km was covered, the different techniques providing overlapping profiles that included the afternoon of June 29 and the early morning of June 30 (local time). There were systematic differences between the chemiluminescent sonde and UV absorption techniques, the sonde giving the greater densities. These differences became larger with increasing altitude up to the maximum common altitude, 62 km. Both airglow and absorption techniques indicate a density minimum at 81 km of 1–3 × 107 cm−3 and agree within the experimental errors in the overlap region down to 72 km. Above 90 km the airglow experiment shows a relatively constant but structured density profile. The mass spectrometer measured a considerably higher ozone density at 90 km with a rapidly decreasing scale height up to 108 km. The experimental results are compared with photochemical‐transport models.