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Determination of Diurnal Average Photodissociation Rates

R. D. RundelNASA/Johnson Space Center, Houston, Tex. 77058

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Abstract

The calculation of diurnal average photolysis rates in models of planetary atmospheres can be done efficiently and easily by utilizing the results of empirical numerical fitting procedures. Analytic expressions are given for the ratio of the diurnal average differential photolysis rate to that at noon, as a function of optical depth, latitude and solar declination. The accuracy is better than ±6% for all altitudes, all seasons of the year and latitudes up to 60°.

Abstract

The calculation of diurnal average photolysis rates in models of planetary atmospheres can be done efficiently and easily by utilizing the results of empirical numerical fitting procedures. Analytic expressions are given for the ratio of the diurnal average differential photolysis rate to that at noon, as a function of optical depth, latitude and solar declination. The accuracy is better than ±6% for all altitudes, all seasons of the year and latitudes up to 60°.

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