Remote sensing of mesospheric winds with the High-Resolution Doppler Imager

Physics

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Doppler Effect, Fabry-Perot Interferometers, Imaging Techniques, Mesosphere, Remote Sensing, Wind Measurement, High Resolution, Oxygen Spectra, Planetary Waves, Upper Atmosphere Research Satellite (Uars)

Scientific paper

Observations of the winds in the upper atmosphere obtained with the High-Resolution Doppler Imager (HRDI) on the Upper Atmosphere Research Satellite (UARS) are discussed. This instrument is a very stable high-resolution triple-etalon Fabry-Perot interferometer, which is used to observe the slight Doppler shifts of absorption and emission lines in the O2 Atmospheric bands induced by atmospheric motions. Preliminary observations indicate that the winds in the mesosphere and lower thermosphere are a mixture of migrating and non-migrating tides, and planetary-scale waves. The mean meridional winds are dominated by the 1,1 diurnal tide which is easily extracted from the daily zonal means of the satellite observations. The daily mean zonal winds are a mixture of the diurnal tide and a zonal flow which is consistent with theoretical expectations.

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