Abstract
The order of magnitude of absorption coefficients for photo-ionization and photo-dissocia­tion continua and their relation to absorption lines and absorption bands are discussed. Measurements and calculations of N 2 , O 2 , N, O and O 3 are summarized and ‘depths of penetration’ into the ‘model atmosphere’ assumed by the Rocket Panel are given. Absorp­tion data for the minor atmospheric constituents are tabulated. The relation of absorption cross-section results to theories of the ionosphere is briefly discussed. Classified references to experimental and theoretical data are given.

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