A record is presented of the absorption of solar radiation by atmospheric ozone in the interval 9.2 – 10.1 microns. Seventy-two independent observations made on seventy days are scattered over the various months of the year. The data are suitable for a first examination of the seasonal trend of stratospheric ozone as revealed by an infrared band. The absorptions are reduced to a quantity proportional to the amount of ozone, and the curve of seasonal change in this quantity is strikingly similar to the seasonal trend in ozone as revealed by the long accepted method of ultraviolet absorption. This further usefulness of the 9.6 micron band of ozone as an atmospheric parameter is thus established.

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* This work was supported in part by a contract with the United States Air Force, through sponsorship of the Geophysical Research Division, Air Force Cambridge Research Center, Air Research and Development Command.