Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 20, issue 1
Articles | Volume 20, issue 1
https://doi.org/10.5194/acp-20-333-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-20-333-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 20, issue 1
Research article
 | 
09 Jan 2020
Research article |  | 09 Jan 2020

Modelled effects of temperature gradients and waves on the hydroxyl rotational distribution in ground-based airglow measurements

Christoph Franzen, Patrick Joseph Espy, and Robert Edward Hibbins

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Latest update: 25 Apr 2024
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Short summary
Ground-based observations of the hydroxyl (OH) airglow have indicated that the rotational energy levels may not be in thermal equilibrium with the surrounding gas. Here we use simulations of the OH airglow to show that temperature changes across the extended airglow layer, either climatological or those temporarily caused by atmospheric waves, can mimic this effect for thermalized OH. Thus, these must be considered in order to quantify the non-thermal nature of the OH airglow.
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