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An unusual mesospheric bore event observed at high latitudes over Antarctica

Nielsen, K.; Taylor, M.J.; Stockwell, R.G.; Jarvis, M.J.. 2006 An unusual mesospheric bore event observed at high latitudes over Antarctica. Geophysical Research Letters, 33 (7), L07803. 4, pp. 10.1029/2005GL025649

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Abstract/Summary

All-sky CCD observations of short-period mesospheric gravity waves have been made from Halley Station, Antarctica (76°S, 27°W). On 27 May, 2001, an unusual wave event exhibiting several features characteristic of a “bore” was observed in the OH, Na, and O2 nightglow emissions. Mesospheric bores are rare wave events that have previously been observed at mid- and low-latitudes. This event was particular interesting as: (1) it initially appeared as a single, high contrast, linear front, accompanied by a sharp enhancement in intensity in all three emissions, (2) a number of trailing wave crests were observed to form with a measured growth rate of 6.6 waves/hr, and (3) the wave pattern exhibited unusual dynamics with significant variability in the observed phase speed and a reduction in the horizontal wavelength by ∼50% over a 1-hr period. The location of Halley and the observed propagation suggests a ducted wave consistent with current bore models.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2005GL025649
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Sun Earth Connections
ISSN: 0094-8276
Additional Information. Not used in RCUK Gateway to Research.: Full text not available from this repository
NORA Subject Terms: Atmospheric Sciences
Date made live: 22 Aug 2007 12:04
URI: http://nora.nerc.ac.uk/id/eprint/91

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