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- W2078107462 abstract "The altitude profiles of oxygen night airglows were observed by rocket experiments at Uchinoura (31 ° N). Simultaneous measurements of emission rates at three different bands of the O2 Herzberg I system, originating from higher, middle and lower vibrational levels of O2(A3Σ+u), suggests that the vibrational distribution of O2(A3Σ+u) is almost invariant in the night airglow and that it varies considerably in the rocket glow. This result is explained by a model for the excitation and de-excitation of the Herzberg I system, where O2(A3Σ+u) is assumed to be excited directly in the three-body recombination of oxygen atoms and to be de-excited mainly due to collisions with atmospheric molecules. A possible range of the rate coefficients of the O2(A3Σ+u) de-excitation is determined to be compatible with the observation. Based on the inferred excitation mechanisms, oxygen atom concentration is deduced from the observed emission rates of the Herzberg I bands within a systematic error of factor 2∼4 in terms of its absolute value and within an error around 20 % in terms of its relative value. The OI green line airglow at 557.7 nm and the O2 Infrared Atmospheric (0,0) baud airglow at 1.27 μm were observed simultaneously with the Herzberg I bands, and their excitation mechanisms are also discussed. The excitation mechanism of the green line is confirmed to be the two-step process. The O2 Infrared Atmospheric system is excited via the three-body recombination of oxygen atoms in an altitude region above ∼90 km, whereas it is likely to be excited mostly by another mechanism below ∼90 km." @default.
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- W2078107462 date "1992-09-01" @default.
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- W2078107462 title "Rocket observations of oxygen night airglows: Excitation mechanisms and oxygen atom concentration" @default.
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- W2078107462 doi "https://doi.org/10.1016/0032-0633(92)90083-z" @default.
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