Atmospheric wave induced O<sub>2</sub> and OH airglow intensity variations: effect of vertical wavelength and damping

Abstract

Abstract. From nocturnal variations of the airglow O 2 (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.

Determination of gravity wave parameters in the airglow combining photometer and imager data

“…From our observation, the amplitude growth reflects theory and agrees reasonably with previous observational works done (e.g. Taori et al, 2007;Taori and Kamalakar, 2013;Takahashi et al, 2011;Ghodpage et al, 2014).…”

“…Airglow emissions are prominent physical phenomena used to further study the vertical and horizontal parameters of gravity waves. According to Takahashi et al (2011), the airglow emission layers that have been extensively used to monitor wave activity in the MLT region are OI5577 (hereafter OI), O 2 (0-1) band (hereafter O 2 ), NaD-line (hereafter NaD) and OH(6-2) band (hereafter OH) at their respective peak emis-sion altitudes of 97, 94, 90 and 87 km. Simultaneous observation of multiple airglow emissions is one of the techniques used to investigate the vertical propagation of gravity waves.…”

A new method to derive middle atmospheric temperature profiles using a combination of Rayleigh lidar and O<sub>2</sub> airglow temperatures measurements

“…The prime methods to explore the thermal structures of this region are airglow monitoring (e.g. Taori and Taylor, 2006;Shepherd et al, 2006;Takahashi et al, 2011), Rayleigh lidar (e.g. Sivakumar et al, 2003;Chandra et al, 2005;Thurairajah et al, 2010), Resonance lidar (e.g.…”

Gravity waves-induced airglow temperature variations, phase relationships, and Krassovsky ratio for OH(8,3) airglow, O2(0,1) atmospheric band, and O(1S) greenline in the MLT region

“…There have been several studies examining the phase relationship between airglow and its temperature using observational data (Chung, et al, 2006;Taori and Taylor, 2006;Takahashi et al, 2011). The results of their studies do not always converge.…”