Abstract
Ground‐based measurements of the atomic oxygen multiplet emission at 844.6nm were made during evening twilight through the fall and winter of 1988/89, from Toronto using a low‐resolution Fabry‐Perot interferometer. Observations were made in the azimuth of the sun at 20° above the horizon, over a local solar zenith angle range from 94° to 99°. The radiance variation as a function of SZA is presented, with correction for atmospheric extinction. These are the first ground based measurements of the 844.6 nm emission ever reported for early twilight. The measurements are an important first step in obtaining the atomic oxygen density as well as the ratio of the integrated photoelectron flux to the solar EUV flux. The results are compared with previous measurements by others.
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