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Fig. 4 | Earth, Planets and Space

Fig. 4

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. 4

A summary plot for NIRAS measurements of OH Meinel (3,1) band and estimated OH rotational temperature on May 29, 2018. a SZA as a function of time b Sensor temperature variations in every 30 s (black) and 3-min average (red) c Geomagnetic field variations in H, D, and Z components observed by a fluxgate magnetometer at Syowa d Dynamic spectrum from 1451 to 1557 nm obtained by the NIRAS. e \(\text {P}_1\)(2), \(\text {P}_1\)(3), and \(\text {P}_1\)(4) line intensities in OH (3,1) band as a function of time. f Estimated OH rotational temperatures in every 3 min (black diamonds) and 30-min smoothed temperatures (red line). Errors of estimated temperatures are mostly less than 4 K. g Same as (f) but 15-min averaged temperatures by error-weighted scheme (black diamonds) and 60-min smoothed temperatures (red line)

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