Doppler Ducting of Quasi-Ripple Wave Events in the Mesospheric OH and O2 Airglow Emissions

Details Doppler Ducting of Quasi-Ripple Wave Events in the Mesospheric OH and O2 Airglow Emissions Doppler Ducting of Quasi-Ripple Wave Events in the Mesospheric OH and O2 Airglow Emissions

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0280s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0280

Physics

0310 Airglow And Aurora, 3332 Mesospheric Dynamics, 3369 Thermospheric Dynamics (0358), 3384 Acoustic-Gravity Waves, 3389 Tides And Planetary Waves

Scientific paper

Short-lived (< 40 min) ripple events are common and well documented phenomena in the mesospheric airglow emissions. Recent coordinated studies have determined that these small-scale wave patterns are primarily due to instabilities processes as indicated by their Richardson number (Ri < 0.25, dynamic and Ri < 0, convective instability). These events are contrasted by the frequent occurrence of well-defined, much larger scale wave patterns, termed bands that are mainly associated with the passage of freely propagating short- period (< 1 hour) gravity waves through the upper mesosphere. Here we present new coordinated imaging and meteor radar measurements of spatially extensive ripple-like events that outwardly appear to be ripple but are not directly due to instability processes. The measurements were obtained as a part of the joint NSF/AFOSR Maui-MALT program using the Utah State University Mesospheric Temperature Mapper (MTM) sequentially sampling the OH and O2 airglow emissions centered at 87 and 94 km, respectively, and the University of Illinois meteor radar providing hourly wind measurements over the altitude range of 80-100 km. Using two years of data 2003-2004, we have identified 20 quasi-ripple events where the background wind measurements clearly show the events to be strongly Doppler ducted (or evanescent) in nature. These relatively rare events provide important new information on the dynamics of wave ducting at mesospheric heights.

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