Abstract

This paper is devoted to the results concerning NO, NO2, and HNO3 obtained during airborne experiments performed in June–July 1973 on Concorde 001. The altitude of flight was about 16 km. Results concerning NO are, within the accuracy of measurement, in agreement with results of a previous spectrometric balloonborne experiment conducted jointly by IASB and ONERA (14 May 1973). Nitric oxide is concentrated in stratospheric layers clearly above the flight altitude. Integrated amount of NO along the optical path is (4 ± 1.5) × 1016 mol cm−2 for a solar elevation varying from +2° above the horizontal plane to −1°. A value of 6 × 108 mol cm−3 may be given as an upper limit for the local concentration at the flight altitude. There is no significant difference in the integrated amount observed at sunset and sunrise. Measured value of NO2 local concentration at 15.5 km is (1.1 ± 0.2) × 109 mol cm−3, in sunset conditions. This value is not greatly modified between 15 km and 30 km. Measured value of HNO3 local concentration at 15.5 km is (1 ± 0.3) × 1010 mol cm−3. This value increases with altitude between 15 km and 20 km. The local concentration is maximum at 20 km. The measured value is (2 ± 1) × 1010 mol cm−3 at 20 km. It seems that local concentration decreases rapidly above 20 km.

© 1975 Optical Society of America

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