Variability of oxygen atom concentration in the lower thermosphere observed by rocket experiments

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A series of rocket experiments was carried out to observe altitude profiles of oxygen atom density and oxygen night airglows at Uchinoura (31 deg N). In the last rocket experiment, S310.21 launched on 28 Jan 1992, the altitude profile of oxygen atom density between 75 km and 200 km was observed with an improved resonant fluorescence instrument developed to avoid the Doppler effect and the aerodynamic shock effect due to the supersonic motion of a rocket. The altitude profile of the OI green line emission rate was simultaneously observed. Comparing the observed profiles, quantitative relations between oxygen atom density and the oxygen airglows are examined, and oxygen atom density is evaluated from the measured airglow profiles. The evaluated profiles of oxygen atom concentration show a significant variability. The variability should be attributed to variation of dynamical transport in this region.

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