Retrieving of Molecular Oxygen Column Density of the Middle and Upper Atmosphere from N2 LBH
JIN Yun-fei1, 2, JIANG Fang1, WANG Yong-mei1, 2*
1. National Space Science Center, Chinese Academy of Sciences，Beijing 100190，China
2. School of Astronomy and Space Science，University of Chinese Academy of Sciences，Beijing 100049，China
Abstract：In this paper, a new method for retrieving of molecular oxygen column density of the middle and upper atmosphere is presented from nadir measured data. From the cross section of absorption for oxygen molecules, we can know that the absorption of molecular oxygen in N2 Lyman-Birge-Hopfield short (LBHS) is strong but it is weak in N2 Lyman-Birge-Hopfield long (LBHL). Based on this characteristic, we propose that the nadir radiation intensity ratio of LBHS to LBHL, ln(LBHS/LBHL) can be used to retrieve molecular oxygen column density of the middle and upper atmosphere. An interpolation table for estimating the molecular oxygen column density is calculated from the airglow model. This table includes ln(LBHS/LBHL) for different oxygen contents, different solar zenith angles, satellite observation angles and solar activity conditions. Then, we get the molecular oxygen column density from ln(LBHS/LBHL) and the corresponding solar zenith angle, satellite observation angle and solar activity index. Finally, we use mode simulation to evaluate the inversion result, which proves that this new method can successfully obtain molecular oxygen column density of the middle and upper atmosphere.
Key words：Middle and upper atmosphere；Airglow；ln(LBHS/LBHL)；Molecular oxygen；Column density
金云飞，江 芳，王咏梅. 基于N2 LBH带的中高层大气氧分子柱密度反演[J]. 光谱学与光谱分析, 2018, 38(05): 1335-1339.
JIN Yun-fei, JIANG Fang, WANG Yong-mei. Retrieving of Molecular Oxygen Column Density of the Middle and Upper Atmosphere from N2 LBH. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(05): 1335-1339.
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