Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa21a0237a&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA21A-0237
Physics
3332 Mesospheric Dynamics, 3389 Tides And Planetary Waves, 3394 Instruments And Techniques
Scientific paper
In May 2002 the sodium lidar at Colorado State University was upgraded from a one-beam to a two-beam system with 14-inch telescopes, resulting in semi-regular observations of mesopause region temperature, zonal and meridional winds on a 24-hour continuous basis. In August 2006 two 30-inch telescopes were added. Our estimates show that the use of dual beam geometry with 30-inch diameter mirrors will lead to signal-to-noise sufficient for the measurement of zonal momentum flux in the mesopause region during the nighttime from September to April, when the Na atom abundance is high. We have now tested the feasibility of night-time three-beam observations with East-West dual beams 20° from zenith using 30-inch telescopes and a North beam 30° from zenith using 14-inch telescope(s) and daytime observations using 14-inch telescopes, one North and one East beam 30° from zenith. This allows determination of nighttime gravity wave zonal momentum flux with simultaneous 24-hour measurements of the mean and tidal fields of mesopause region temperature, zonal and meridional winds. Such a data set can provide not only the vertical profile of nighttime momentum flux but could also shed light on the accompanying tide-gravity wave interactions. Initial results of these new measurements at Colorado State University will be reported.
Acott Phil E.
Krueger David A.
She Canlin
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