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Unusual Intensity Patterns of OH(6,2) and O(1S) Airglow Driven by Long‐Period Waves Observed Over the Andes Lidar Observatory.

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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, Yolián1,2 (AUTHOR) yolianamaro@gmail.com, Vargas, Fabio3 (AUTHOR), Huang, Tai‐Yin4 (AUTHOR), Urbina, Julio1 (AUTHOR)
Source: Journal of Geophysical Research. Space Physics. Jan2021, Vol. 126 Issue 1, p1-18. 18p.
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.Key Points: Unusual O(1S) enhancements concurrent with OH(6,2) weakening observed using airglow imager dataMost of the unusual events occurred during the months of April and OctoberSimulations illustrate how the combination of factors (larger wave amplitudes, vertical wavelength, etc.) can produce the unusual pattern [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Unusual Intensity Patterns of OH(6,2) and O(<superscript>1</superscript>S) Airglow Driven by Long‐Period Waves Observed Over the Andes Lidar Observatory.
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  Data: <searchLink fieldCode="AR" term="%22Amaro‐Rivera%2C+Yolián%22">Amaro‐Rivera, Yolián</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> yolianamaro@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Vargas%2C+Fabio%22">Vargas, Fabio</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Tai‐Yin%22">Huang, Tai‐Yin</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Urbina%2C+Julio%22">Urbina, Julio</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Jan2021, Vol. 126 Issue 1, p1-18. 18p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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.Key Points: Unusual O(1S) enhancements concurrent with OH(6,2) weakening observed using airglow imager dataMost of the unusual events occurred during the months of April and OctoberSimulations illustrate how the combination of factors (larger wave amplitudes, vertical wavelength, etc.) can produce the unusual pattern [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1029/2020JA028091
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      – Code: eng
        Text: English
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      – TitleFull: Unusual Intensity Patterns of OH(6,2) and O(1S) Airglow Driven by Long‐Period Waves Observed Over the Andes Lidar Observatory.
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            NameFull: Vargas, Fabio
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            NameFull: Huang, Tai‐Yin
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              M: 01
              Text: Jan2021
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              Y: 2021
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