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Table 3 A summary of spectral characteristics of OH (3,1) and \(\text {N}_2^+\) (1,2) bands for the two aurora events observed by the NIRAS

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

Event May 6, 2018 @ Syowa September 21, 2019 @ Kiruna
Aurora morphology Aurora breakup Isolated aurora arc intensification
NIRAS FWHM 2.5 nm 3.3 nm
OH temperature (nightly mean) 215.8 K 210.9 K
Wavelength: \(\text {P}_1(2)\), OH (3,1) band 1521.2–1525.7 nm 1520.8–1526.3 nm
Intensity of OH (3,1) band 24.6 kR 37.1 kR
Intensity of \(\text {N}_2^+\) (1,2) band 35.5 kR 41.8 kR
Ratio \(\text {N}_2^+\) (1,2) / OH (3,1) 1.4 1.1
Wavelength: \(\text {P}_1(4)\), OH (3,1) band 1540.1–1544.6 nm 1540.7–1545.2 nm
Intensity of OH (3,1) band 21.2 kR 27.3 kR
Intensity of \(\text {N}_2^+\) (1,2) band 15.9 kR 18.5 kR
Ratio \(\text {N}_2^+\) (1,2) / OH (3,1) 0.75 0.67
Contaminated OH temperature 178.8 K 172.0 K
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