Doppler Ducting Measurements of Short-Period Gravity Waves and Mesospheric Bores in OH and O2 Airglow Emissions

Details Doppler Ducting Measurements of Short-Period Gravity Waves and Mesospheric Bores in OH and O2 Airglow Emissions Doppler Ducting Measurements of Short-Period Gravity Waves and Mesospheric Bores in OH and O2 Airglow Emissions

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa41a1545s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA41A-1545

Physics

0310 Airglow And Aurora, 3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Acoustic-Gravity Waves, 3394 Instruments And Techniques

Scientific paper

Under special wind conditions short-period gravity waves and bores can be Doppler ducted in a region of vertical propagation bounded by regions of evanescence in the mesosphere and lower thermosphere (80- 100 km). The bore events are characterized by long-lived, sharp bright (or dark) leading fronts that are usually accompanied by a growing number of coherent wave crests. Using simultaneous imaging and background wind measurements from Maui, Hawaii (20.70 N, 156.30 W), during 2003, the ground-relative and intrinsic parameters of ducted short-period waves have been investigated. Here we present two examples of small-scale, short-period gravity wave and bore events observed in the mesospheric OH and O2 airglow emissions. The measurements were obtained using the Utah State University Mesospheric Temperature Mapper (MTM) which sequentially sampled the near-infrared OH and O2 airglow emissions centered at ~87 and ~94 km, respectively, and the University of Illinois meteor radar which provided continuous hourly wind measurements over the altitude range of 80-100 km. Utilizing measurements of the local background wind field, the intrinsic wave parameters and hence the propagation nature of the wave can be investigated. In this paper, we present new evidence for strongly ducted waves and compared their signatures with theoretical Doppler ducting profiles.

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