A tidal wind model for 85-120 km based on CIRA-86 - A feasibility study

Physics

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Atmospheric Tides, Climatology, Mesosphere, Thermosphere, Wind Profiles, Wind Velocity Measurement, Atmospheric Temperature, Diurnal Variations, Radar Measurement, Tides, Vertical Distribution

Scientific paper

The feasibility of deriving a climatology of the diurnal variations of the wind in the 85-120 km region from the tidal components of density, temperature and composition contained in the new COSPAR CIRA-86 is examined. The CIRA density and temperature model is employed to derive the eastward and northward pressure gradient forces that serve as the forcing functions in the coupled momentum equations. At midlatitudes, the model shows some of the general features observed in the radar tidal data, e.g., the dominant semidiurnal tide with increasing amplitude with height and clockwise (counterclockwise) rotation of the velocity vector seen in the Northern (Southern) Hemisphere.

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