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Fig. 6 | Earth, Planets and Space

Fig. 6

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. 6

NIRAS measurements with the 150-lpmm grating at IRF, Kiruna on September 21, 2019. a Local K-index obtained from geomagnetic field observations at Kiruna. b and c are keograms along geomagnetic north–south and east–west directions, respectively. d Auroral intensity at a geographic 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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