Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1848m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1848
Physics
[3389] Atmospheric Processes / Tides And Planetary Waves
Scientific paper
The network of high-frequency radars known as the Super Dual Auroral Radar Network (SuperDARN) is capable of detecting backscatter from meteor trails at ranges close to the radar locations. From these meteor trail echoes the neutral wind in the mesosphere (90-95 km) is inferred by applying a least-square fit to the line-of-sight velocities over a range of azimuthal angles for each beam-direction the radar scans through. By analyzing a large database of these winds, a well-known atmospheric feature, the quasi-two-day wave, is observed over a wide range of latitudes across North America. This study focuses on general features of the amplitude and period of this wave as well as variations between radar sites. Of particular interest is the observed change in amplitude of the diurnal and semi-diurnal tides during the presence of a strong quasi-two-day wave. In addition, secondary waves are detected from the nonlinear coupling between the tides and the quasi-two-day wave. Utilizing extended measurements over the network allows for a better characterization of the structure in the observed waves and tides.
Mccubbin E. A.
Shepherd Simon G.
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