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Wind filtering evidence of mesospheric short-period gravity waves revealed from all-sky images at King Sejong Station (62{degree sign}S, 59{degree sign}W)
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  • Jeong-Han Kim,
  • Hosik Kam,
  • Yong Ha Kim,
  • In-Sun Song,
  • Byeong-Gwon Song,
  • Takuji Nakamura,
  • Yoshihiro Tomikawa,
  • Masaru Kogure,
  • Mitsumu K. Ejiri,
  • Septi Perwitasari,
  • Masaki Tsutsumi
Jeong-Han Kim
Korea Polar Research Institute

Corresponding Author:[email protected]

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Hosik Kam
Korea Polar Research Institute
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Yong Ha Kim
Chungnam National University
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In-Sun Song
Korea Polar Research Institute
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Byeong-Gwon Song
Korea Polar Research Institute
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Takuji Nakamura
National Institute of Polar Research,Kyoto University
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Yoshihiro Tomikawa
National Institute of Polar Research
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Masaru Kogure
Kyushu University
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Mitsumu K. Ejiri
National Institute of Polar Research
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Septi Perwitasari
Tohoku University
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Masaki Tsutsumi
National Institute of Polar Research
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Abstract

We analyzed OH airglow images observed from an all-sky camera at King Sejong Station, Antarctica for the period of 2012–2016. Using M-transform method, 2D-power spectra of short period waves (< 1 hr) were obtained from 107 image sequences. The power spectral densities evidently show that the mesospheric wave activity is the strongest during winter. We also constructed climatological wind blocking diagrams using horizontal winds obtained from MERRA-2 for the altitudes of = 10–64 km, and from KSS meteor radar data for = 80–90 km. The wind blocking diagrams are negatively matched with the dominant propagating directions of the observed slow speed waves (< 30 m/s), providing the graphical evidence of wind filtering effects. However, there are significant eastward waves in winter and strong south-eastward waves in spring that are not blocked by the stratospheric winds. We speculate that these waves may be generated from the upper stratosphere or mesosphere.