Ducting Conditions for Observed Bore-Like Events in the Upper Mesosphere and Lower Thermosphere

Details Ducting Conditions for Observed Bore-Like Events in the Upper Mesosphere and Lower Thermosphere Ducting Conditions for Observed Bore-Like Events in the Upper Mesosphere and Lower Thermosphere

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0294w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0294

Physics

0350 Pressure, Density, And Temperature, 3332 Mesospheric Dynamics, 3384 Acoustic-Gravity Waves

Scientific paper

Instances of traveling airglow fronts in the upper mesosphere and lower thermosphere (MLT) have been identified as mesospheric bores. They are ducted phenomena and have been observed in association with mesospheric inversions and strong wind shears. Airglow fronts often show an out-of-phase relation between OH and O2 (the former brightens while the latter dims). This talk reports on a numerical study of ducted waves in the upper mesosphere and focuses on conditions (e.g., inversion thickness and strength, wind shear) that give ducting in altitude regions where the upper mesospheric-lower thermospheric airglow layers are found. We analyze the vertical modal structure and the airglow signature of ducted waves for two events. The first is the dramatic event described and analyzed by Smith et al. (2003) that occurred in the south western United States. The second is an event observed over Alice Springs, Australia with the Aerospace airglow imager. Under typical conditions there is a stable layer in the lower thermosphere and ducted modes can involve both layers to a greater or lesser extent. We find ducted modes that resemble observed modes in terms of phase speeds and wavelengths, but (unlike for tropospheric bores) the waves are not necessarily the lowest mode the system can support. These modes include but are not necessarily confined to the upper mesospheric stable layer. Smith, S. M., et al., A multidiagnostic investigation of the mesospheric bore phenomenon, J. Geophys. Res., 108, 2003

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