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• W2150383873 endingPage "23287" @default.
• W2150383873 startingPage "23275" @default.
• W2150383873 abstract "The Ultraviolet Limb Imaging (UVLIM) experiment flew on STS‐39 in the spring of 1991 to observe the Earth's thermospheric airglow and included a far ultraviolet (1080‐1800 Å) spectrometer. We present first results from this spectrometer, including a spectroscopic analysis at 6‐Å resolution of H, O, N, and N 2 day glow emissions and modeling of the observed limb‐scan profiles of dayglow emissions. The observed N 2 Lyman‐Birge‐Hopfield (LBH) emission reflects a vibrational population distribution in the a¹Π g state that differs significantly from those predicted for direct electron excitation and excitation with cascade from the a′ ¹Σ u − and w ¹Δ u states. The Vibrational population distribution and LBH brightnesses suggest a total cascade rate 45% that of direct excitation, in contrast to laboratory measurements. For the first time, pronounced limb brightening is observed in both the N I λ1135 and N I λ1200 limb emission profiles, as expected for emissions excited by N 2 dissociation which produces kinetically fast N fragments; however, optically thick components of these features are also observed. Preliminary modeling of the O I λ1356, H I λ1216, and O I λ1304 and O I λ1641 emissions agrees to within roughly 10% of the observed limb‐scan profiles, but the models underestimate the N 2 LBH profiles by a factor of 1.4‐1.6, consistent with the inferred cascade effect. Other findings include: an O I λ1152/λ1356 intensity ratio that is inconsistent with the large cascade contribution to O I λ1356 from np 5 P states required by laboratory and nightglow observations; nightglow observations of the tropical ultraviolet arcs exhibit a wide range of O I λ1356/λ1304 intensity ratios and illustrate the complicated observing geometry and radiative transfer effects that must be modeled; and we find a 3‐σ upper limit of 8.5 R to the total LBH vehicle glow emission." @default.
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• W2150383873 date "1994-12-01" @default.
• W2150383873 modified "2023-09-30" @default.
• W2150383873 title "Observations of the far ultraviolet airglow by the Ultraviolet Limb Imaging Experiment on STS-39" @default.
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• W2150383873 doi "https://doi.org/10.1029/94ja01543" @default.
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