Fig. 1 The OH Meinel and O2 AB systems are important features of the nightglow. The OH Meinel and O2 AB systems are important features of the nightglow.

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Presentation transcript:

Fig. 1 The OH Meinel and O2 AB systems are important features of the nightglow. The OH Meinel and O2 AB systems are important features of the nightglow. (A) Astronomical night sky spectrum obtained using the Echelle Spectrograph and Imager on the Keck II telescope displays strong OH Meinel band emission (4 March 2000, 8:58 UT; λ/Δλ, ~7000; 50-min exposure) (14). The inset shows the weak (0,1) band of the O2 AB system near 864.5 nm. (B) Potential energy curve and vibrational levels of the OH ground state. The red arrow indicates a representative OH Meinel feature—the (8,4) band near 937 nm. (C) Observed OH vibrational population distribution in the nightglow (green) and nascent distribution from the H + O3 reaction (blue) (12, 14). (D) Low-lying electronic states of O2. The red arrow indicates the strong (0,0) O2 (b1∑g+ − X3∑g−) emission near 762 nm that is absorbed by the atmosphere and is observable only from space. Konstantinos S. Kalogerakis Sci Adv 2019;5:eaau9255 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).