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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

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. 2

Typical nightly mean spectrum obtained from NIRAS measurements on May 29 and May 6, 2018. a A spectra with the 600-lpmm grating and a center wavelength of 1504 nm. b A spectra with the 150-lpmm grating and a center wavelength of 1371 nm. It should be noted that data near the edge on a short wavelength side is not reliable, and therefore not used for quantitative discussions

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