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- Title
Unusual Intensity Patterns of OH(6,2) and O(¹S) Airglow Driven by Long-Period Waves Observed Over the Andes Lidar Observatory.
- Authors
Amaro-Rivera, Yolián; Vargas, Fabio; Tai-Yin Huang; Urbina, Julio
- Abstract
Simultaneous OH(6,2) and O(¹S) nightglow measurements obtained at the Andes Lidar Observatory (ALO) (30.3°S, 70.7°W) from September 2011 to April 2018 have been analyzed to investigate an unusual intensity pattern, that is, O(¹S) nightglow intensity enhancement concurrent with OH(6,2) nightglow intensity weakening. We identified 142 nights showing that behavior during the ~6.5-year period. The data set comprised of these 142 nights displayed a semiannual occurrence rate with maxima during the equinoxes. A semidiurnal tide fitting applied to the 30-min bin size monthly averaged data shows that the largest amplitudes of the tide occur in April--May and August--September in both OH(6,2) and O(¹S). SABER atomic oxygen (O) climatology near ALO shows higher O densities near the equinoxes, with maximum O densities in March and September at ~96 km. Lidar temperature analysis suggests that the O(¹S) enhancement concurrent with the OH(6,2) weakening is often accompanied by a temperature increase at 96 km and a decrease at 87 km. Simulations using airglow models have also been carried out to investigate the effect of a long-period oscillation on the OH(6,2) and O(1S) airglow intensities. A sensitivity study has also been conducted to illustrate the effect of the characteristics of a long-period wave on the airglow intensity patterns.
- Subjects
NIGHTGLOW (Atmospheric radiation); OXYGEN; AIRGLOW; LIDAR; ATMOSPHERIC tides
- Publication
Journal of Geophysical Research. Space Physics, 2021, Vol 126, Issue 2, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2020JA028091