Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 19, issue 4
Articles | Volume 19, issue 4
https://doi.org/10.5194/acp-19-2629-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/acp-19-2629-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 4
Technical note
 | 
28 Feb 2019
Technical note |  | 28 Feb 2019

Technical note: Bimodality in mesospheric OH rotational population distributions and implications for temperature measurements

Konstantinos S. Kalogerakis

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Latest update: 11 Jul 2025
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Short summary
Light emission from energetic hydroxyl radical, OH*, is a prominent feature in spectra of the night sky. It is routinely used to determine the temperature of the atmosphere near 90 km. This note shows that the common practice of using only a few emission features from low rotational excitation to determine rotational temperatures does not account for the bimodality of the OH population distributions and can lead to large systematic errors.
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Layered phenomena in the mesopause region (ACP/AMT inter-journal...
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