We report on observations of small-scale gravity wave breaking into turbulence around the mesopause height using an OH airglow CCD camera and a meteor radar performed on December 23, 1995 in Japan. The small-scale gravity wave propagated against the background wind with a horizontal wavelength of ∼27 km, an apparent horizontal phase velocity of ∼7 ms−1, and an intrinsic period of ∼5.6 minutes. Wave breaking event began with an appearance of smaller-scale structures, which were aligned parallel to the phase fronts of the breaking wave and advanced into more random, turbulence-like features. The instability structures were present in the OH images for about 40 minutes.
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