A global study of airglow: Day and twilight |
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| Authors: | JF Noxon |
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| Institution: | Fritz Peak Observatory, Aeronomy Laboratory, NOAA/ERL Boulder, CO 80303, U.S.A. |
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| Abstract: | Aircraft measurements of emission made over a 10-yr period provide information on the variation of ozone with latitude and season in the altitude region 50–90 km. Between 50 and 70 km there appears to be little variation (< ± 25%) whereas the abundance between 80 and 90 km exhibits a large seasonal change north of 30°N and much less at lower latitude. At mid and high latitude the column abundance above ～ 80 km changes from ? 1 × 1014 cm?2 in summer to about 3 × 1014 cm?2 in winter. There are occasional enhancements in both the day and twilight airglow which almost always occur in association with auroral activity or, at least, where such activity is statistically most likely. These enhancements appear to reflect a corresponding increase in the ozone mixing ratio in the upper stratosphere. While the gradient in ozone mixing ratio with latitude is generally small at altitudes between 50 and 90km there are occasions when a temporary latitude structure can be seen, particularly above 80 km. |
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