Mesospheric ozone concentration at an equatorial location from the 1.27-μm O2 airglow emission

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Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Meteorology And Atmospheric Dynamics: Radiative Processes

Scientific paper

The vertical emission profile of the O2(a1Δg) airglow at 1.27 μm has been measured during the evening twilight near the equator (Alcântara, Brazil; 2.5°S, 44.2°W) using a rocket-borne infrared photometer. The profile is used to derive the vertical distribution of ozone between 60 and 86 km. The ozone profile shows a minimum concentration at 77 km and a secondary maximum of 1.34×108 cm-3 at 82 km. The height of the secondary maximum is lower than observed at midlatitudes, and the 77-km minimum is sharper than that which has been observed at low latitudes by satellite measurements.

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