Observations of absorption of solar radiation by atmospheric nitric acid obtained on different balloon flights are presented. This absorption occurs in three different wavelength intervals. The use of the very long paths, occurring near sunset, for enhancing weak absorption is discussed.
© 1969 Optical Society of America
DAVID G. MURCRAY, T. G. KYLE, F. H. MURCRAY, and W. J. WILLIAMS, "Presence of HNO3 in the Upper Atmosphere," J. Opt. Soc. Am. 59, 1131-1134 (1969)