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Instability limits the usefulness of indirect sounding, i.e. the deduction of a physical distribution from a set of observations which rcprcsent an integral transform of the former. A method is presented which allows 5t stable, but smoothed, solution to be obtained in certain cases. As an illustrztion cf the application cf the method, the deduction of vertical ozone distribution from rneasuremcnts of the spectral distribution of scattered ultraviolet radiation is discussed. Graphs showing results from several pcssible methods of inversion are included to show the difficulties essociatcd with such indirect measurements.

A DISCUSSION OF INDIRECT SOUNDING METHODS WITH SPECIAL REFERENCE TO THE DEDUCTION OF VERTICAL OZONE DISTRIBUTION FROM LIGHT SCATTERING MEASUREMENTS