Analysis and interpretation of airglow and radar observations of quasi-monochromatic gravity waves in the upper mesosphere and lower thermosphere over Adelaide, Australia (35°S, 138°E)
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...…propagation, and potential for instability and mean flow interactions (e.g., Gavrilov and Shved 1982; Taylor et al. 1995; Taylor and Hapgood 1988; Hecht et al. 1997, 2001; Walterscheid et al. 1999; Nakamura et al. 2003; Smith et al. 2009; Pautet et al. 2014; Hecht et al. 2014; Fritts et al. 2014)....
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...Walterscheid et al. (1999) reported 10-month observations of OH and O2 airglow images at Adelaide, Australia (24◦S, 138◦E)....
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...As discussed by Walterscheid et al. (1999) and Suzuki et al. (2004), the poleward- (southward-) moving waves over the Australian continent in summer are likely to be generated by strong convective activities in the equatorial latitudes, propagating in the mesospheric thermal duct over long distance....
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...On the other hand, if the poleward-moving waves observed at Darwin and Adelaide in summer are ducted, as suggested by Walterscheid et al. (1999) and Suzuki et al. (2004), they would not carry momentum flux to the mesopause region....
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...Similar zonal tendency (eastward in summer and westward in winter) was also weakly seen in statistical results by Walterscheid et al. (1999) at Adelaide, although the preference was mainly in the meridional direction....
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...Walterscheid et al. (1999) showed that during the Australian summer, small-scale waves in the airglow images were predominantly poleward-propagating, while during the Australian winter they were predominantly equatorward....
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...[19] Bores (or more generally long-lived horizontally propagating wave trains) require ducting to maintain the traveling disturbance [Walterscheid and Hickey, 2009; Walterscheid et al., 1999; Crook, 1986; Rottman and Grimshaw, 2002]....
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References
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