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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

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. 7

Spectrum in a wavelength range from 1400 to 1600 nm obtained a at Syowa station, on May 6, 2018 and b at IRF on September 21, 2019. A black solid line is nightly mean spectrum, and therefore OH airglow emissions are thought to be dominant. Red and blue lines are spectrum observed at aurora breakup with time resolutions of 3 min (2210:00 UT on May 6, 2018 and 2152:00 UT on September 21, 2019) and 30 s (2211:00 UT on May 6, 2018 and 2154:30 UT on September 21, 2019), respectively

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