ANGEO Annales Geophysicae ANGEO Ann. Geophys. 1432-0576 Copernicus Publications Göttingen, Germany 10.5194/angeo-29-631-2011 Atmospheric wave induced O<sub>2</sub> and OH airglow intensity variations: effect of vertical wavelength and damping Takahashi H. 1 Onohara A. 1 Shiokawa K. 2 Vargas F. 3 Gobbi D. 1 Aeronomy division, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, Brazil Solar Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, USA 07 04 2011 29 4 631 637 Copyright: © 2011 H. Takahashi et al. 2011 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://angeo.copernicus.org/articles/29/631/2011/angeo-29-631-2011.html The full text article is available as a PDF file from https://angeo.copernicus.org/articles/29/631/2011/angeo-29-631-2011.pdf

From nocturnal variations of the airglow O<sub>2</sub> (0-1) and OH Meinel (6-2) band emission intensity and the rotational temperature, gravity waves and the damping effect in the MLT region were investigated. The data set was obtained from photometer measurements at Rikubetsu (43.5° N, 143.8° E), Japan, from March 2004 to August 2005. The ratio of the amplitude of oscillation and their phase difference between the two emissions were calculated when simultaneous periodic variations were observed. The ratio showed a linear correlation with the phase difference. The vertical wavelength and damping rate were estimated by using a model calculation carried out by previous works. The results show that the wave damping is significant when the vertical wavelength is shorter than 30–40 km. Krassovsky's parameter η, which represents a ratio between the emission intensity and temperature oscillations, was also calculated. The results show that the η also depends on the damping effect.

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