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Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

From: Temporal evolutions of \(\text {N}_2^+\) Meinel (1,2) band near \(1.5.\,\upmu \text {m}\) associated with aurora breakup and their effects on mesopause temperature estimations from OH Meinel (3,1) band

Fig. 8

Summary plots for evaluating \(\text {N}_2^+\) Meinel (1,2) auroral contaminations to OH (3,1) band measurements based on spectral data a at Syowa station, on May 6, 2018 and b at Kiruna on September 21, 2019. (Top) The nightly mean spectrum (black) and artificial spectrum (red) that are created from convolutions of OH (3,1) band spectrum (\(\text {P}_1\)(2), \(\text {P}_1\)(3), \(\text {P}_1\)(4), \(\text {P}_2\)(2), \(\text {P}_2\)(3), and \(\text {P}_2\)(4)) and instrumental functions. (Middle) Red and blue lines are the artificial OH airglow spectrum and the observed \(\text {N}_2^+\) Meinel (1,2) aurora spectrum, respectively. Synthetic spectrum are shown by black lines. (Bottom) Ratio between OH airglow intensity and total intensity (OH airglow and \(\text {N}_2^+\) Meinel (1,2)) as a function of wavelength

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