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Fig. 5 | Earth, Planets and Space

Fig. 5

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. 5

NIRAS measurements with the 150-lpmm grating on May 6, 2018 and comparisons to observed aurora activity. a Geomagnetic field variations in H, D, and Z components (b) and c Aurora keograms along magnetic latitudinal directions obtained from all-sky aurora imagers for \(\text {N}_2^+\) 427.8 nm and O 557.7 nm, respectively d Aurora intensity of O 557.7 nm emission at magnetic zenith as a function of time. e Dynamic spectrum from 1114 to 1624 nm obtained by the NIRAS. f \(\text {P}_1\)(2), \(\text {P}_1\)(3), and \(\text {P}_1\)(4) line intensities in OH (3,1) band as a function of time

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