An unusual mesospheric bore event observed at high latitudes
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...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.526.2542 http://www.astro.ex.ac.uk/people/mjm/oh_airglow/Neilsen_2005GL025649.pdf |
| Summary: | 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 formwith ameasured 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. Citation: Nielsen, K., M. J. Taylor, R. G. Stockwell, and M. J. Jarvis (2006), An unusual mesospheric bore event observed at high latitudes over Antarctica |
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