An unusual mesospheric bore event observed at high latitudes over Antarctica

作者：Nielsen K^*; Taylor MJ; Stockwell RG; Jarvis MJ

来源：Geophysical Research Letters, 2006, 33(7): L07803.

DOI：10.1029/2005GL025649

All-sky CCD observations of short-period mesospheric gravity waves have been made from Halley Station, Antarctica (76 degrees S, 27 degrees W). On 27 May, 2001, an unusual wave event exhibiting several features characteristic of a "bore'' was observed in the OH, Na, and O-2 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 similar to 50% over a 1-hr period. The location of Halley and the observed propagation suggests a ducted wave consistent with current bore models.

• 出版日期2006-4-5
• 单位British Antarctic Survey