A simultaneous measurement of the vertical profiles of sodium nightglow and atomic sodium density in the upper atmosphere

Computer Science – Sound

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Atmospheric Density, Atom Concentration, Nightglow, Sodium, Upper Atmosphere, Vertical Distribution, Optical Radar, Rocket Sounding, Rocket-Borne Instruments

Scientific paper

On May 31, 1992, a rocket payload equipped with 10 airglow photometers was launched from the Alcantara Launch Center in Northern Brazil. The payload was designed to measure sodium, hydroxyl, atomic and molecular oxygen airglow emissions, in addition to electron density and temperature. At the time of launch, a sodium lidar was operated at the same site, giving vertical profiles of atmospheric sodium density. The measured vertical profiles of the Na D line emission and atomic sodium density are remarkably similar, with sharp boundaries at 81 km and 99 km. On the assumption that the Chapman mechanism is responsible for the Na D emission, the measurements imply an almost constant ozone density of 4 x 10 exp 7/cu cm between 87 and 99 km. The unexpectedness of this height independent ozone concentration suggests that our understanding of the sodium excitation mechanism might be inadequate.

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