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An analytic form is given for the energy‐transfer rate from photoelectrons to thermal electrons. The expression fits the classical formulation of Itakawa tnd Aono (1966) at low energies and gives a smooth transition to fit the quantum mechanical equation of Schunk and Hays (1971) at higher energies. The corresponding loss function or stopping power has a form that is convenient in auroral and dayglow calculations.

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Tabulated values are presented for ultraviolet radiation at the earth's surface as a function of wavelength, latitude, and season, for clear sky and seasonally and latitudinally averaged ozone amounts. These tabulations can be combined with any biological sensitivity function in order to obtain the seasonal and latitudinal variation of the corresponding effective doses. The integrated dosages, based on the erythema1 sensitivity curve and on the Robertson-Berger sunburn-meter sensitivity curve, have also been calculated, and these are found to vary with latitude and season in very nearly the same way as 307 and 314 nm radiation, respectively. I79 P A.P. 2313-c T h l e I The calculated integrated daily global UV radiation at sea level (direct solar beam plus scattered skylight) for clear sky in 1 nm wavelength bands at 5nm wavelength intervals from 285 to 340nm, in units of J m-' The ldst column shows the integrated annual radiation. Average amounts of ozone for latitude and season have been used in the calculation (1.5718-05 means 1571 x AT WAVELENGTHtNM)