Global Observation of Planetary-Scale Waves in UARS HRDI and WINDII MLT Winds

Details Global Observation of Planetary-Scale Waves in UARS HRDI and WINDII MLT Winds Global Observation of Planetary-Scale Waves in UARS HRDI and WINDII MLT Winds

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999umaa.conf.....l&link_type=abstract

Technical Report, Michigan Univ. Ann Arbor, MI United States Dept. of Atmospheric, Oceanic, and Space Science

Physics

1

Kelvin Waves, Planetary Waves, Solar Orbits, Planetary Evolution, Data Acquisition, Confinement, Divergence, Mesosphere, Momentum, Spectra, Temperate Regions, Thermosphere, Tides, Viewing

Scientific paper

The purpose of this study is to use examine planetary-scale motions in the UARS mesosphere and lower thermospheric data. The actual study was confined to HRDI winds and temperatures, since these observations were more continuous, and spanned the 60-120 km range. Three classes of waves were studied: fast equatorial Kelvin waves, nonmigrating tides, and the midlatitude 2-day wave. The purpose of the Kelvin wave and the 2-day wave studies was to test whether the waves significantly affect the mean flow. Such studies require high-quality spectral definitions in order to derive the wave heat and momentum flux divergence which can act in comination to drive the mean flow. Accordingly, HRDI winds from several special observing campaigns were used for analyses of fast (periods under 5 days) waves. The campaigns are characterized by continuous viewing by HRDI in 2 viewing directions, for periods of 10-12 days. Data sampled in this manner lend themselves quite well to "asynoptic spectral analysis", from which motions with periods as low as one day can be retrieved with relatively minimal aliasing.

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