Abstract

The balloon apparatus and some of the results of the direct solar radiation investigations up to 30 km in the middle belt of the Soviet Union in 1961–1965 are briefly described. Measurements of total direct solar radiation showed that the aerosol extinction properties in the free atmosphere are rather considerable, not only up to 30 km but also at the higher levels. The layered character of the stratospheric optical structure is demonstrated. The dynamics of layers and the possible influence of volcanic activity is discussed. Spectral investigations in the 0.35–13 μ region demonstrated that the stratospheric humidity is small, approximating 10−6–10−5 g/g. The measurements in the visible spectrum confirmed that stratospheric aerosol component is essential, the stratospheric optical density being about 10−4–10−3 km−1. Comparison of the results of spectral and integral investigations indicates that the aerosol extinction is also dominant above 30 km.

© 1967 Optical Society of America

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