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Conferences > ORSA > 1991 > OThA > OThA2

Recent Advances in the Analysis of Twilight Spectra to Retrieve Atmospheric Constituents

P.V. Johnston, R.L McKenzie, and S. Solomon

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Abstract

For several years, spectral measurements of zenith sky intensities made have been used to measure a range of gases of aeronomie interest. At twilight the geometric path through the atmosphere is long compared with that at midday, so the ratio of a twilight spectrum divided by a midday spectrum can be used to remove solar absorption features and reveal the features due to terrestrial absorption. A least-squares analysis method is then used to convert the excess twilight absorptions to column amounts. The method has been successfully applied to measuring a range of gases, including NO2, NO3, O3, and OCIO.

© 1991 Optical Society of America

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