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An Unusual Mesospheric Bore Event Observed At High Latitudes Over Antarctica, K. Nielsen, Michael J. Taylor, R G. Stockwell, M. J. Jarvis

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All-sky CCD observations of short-period mesospheric gravity waves have been made from Halley Station, Antarctica (76S, 27W). 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 …