Preprints
https://doi.org/10.5194/angeo-2021-65
https://doi.org/10.5194/angeo-2021-65

  10 Nov 2021

10 Nov 2021

Review status: this preprint is currently under review for the journal ANGEO.

Propagating characteristics of mesospheric gravity waves observed by an OI 557.7 nm airglow all-sky camera at Mt. Bohyun (36.2°N, 128.9°E)

Jun-Young Hwang1, Young-Sook Lee1, Yong Ha Kim1, Hosik Kam2, Young-Sil Kwak2,3, and Tae-Yong Yang2 Jun-Young Hwang et al.
  • 1Department of Astronomy and Space Science, Chungnam National University, Daejeon, South Korea
  • 2Korea Astronomy and Space Science Institute, Daejeon, South Korea
  • 3Department of Astronomy and Space Science, University of Science and Technology, Daejeon, South Korea

Abstract. We analyzed all-sky camera images observed at Mt. Bohyun observatory (36.2°N, 128.9°E) for the period of 2017–2019. The image data were acquired with a narrow band filter centered at 557.7 nm for the OI airglow emission at ~96 km altitude. The total of 150 wave events were identified in the images of 144 clear nights. The interquartile ranges of wavelength, phase speed, and periods of the identified waves are 20.5–35.5 km, 27.4–45.0 m/s and 10.8–13.7 min with the median values of 27.8 km, 36.3 m/s and 11.7 min, respectively. The summer and spring bias of propagation directions of northeast- and northward, respectively, can be interpreted as the effect of filtering by the prevailing winds in the lower atmosphere. In winter the subdominant northwestward waves may be observed due to nullified filtering effect by small northward background wind or secondary waves generated in the upper atmosphere. Intrinsic phase speeds and periods of the waves were also derived by using the wind data simultaneously observed by a nearly co-located meteor radar. The nature of vertical propagation was evaluated in each season. The majority of observed waves are found to be freely propagating, and thus can be attributed to wave sources in the lower atmosphere.

Jun-Young Hwang et al.

Status: open (until 22 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2021-65', Anonymous Referee #1, 16 Nov 2021 reply
    • CC1: 'Reply on RC1', Young-Sook Lee, 27 Nov 2021 reply
  • RC2: 'Comment on angeo-2021-65', Anonymous Referee #2, 24 Nov 2021 reply

Jun-Young Hwang et al.

Jun-Young Hwang et al.

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Short summary
We analyzed all-sky camera images observed at Mt. Bohyun observatory (36.2°N, 128.9°E) for the period of 2017–2019. We retrieved gravity wave parameters including horizontal wavelength, phase velocity and period from the image data. The horizontally propagating directions of the wave were biased according to their seasons, exerted with filtering effect by prevailing background winds. We also evaluated the nature of vertical propagation of the wave for each season.