Thermospheric winds and exospheric temperatures from incoherent scatter radar measurements in four seasons

Physics

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Atmospheric Temperature, Exosphere, Incoherent Scattering, Ion Motion, Radar Measurement, Thermosphere, Wind Measurement, Annual Variations, Atmospheric Circulation, Boundary Conditions, Boundary Value Problems, Drift Rate, Dynamic Models, Numerical Integration, Wind (Meteorology)

Scientific paper

The time-dependent equations of neutral air motion are solved subject to three constraints: two of them are the usual upper and lower boundary conditions and the third is the value of the wind-induced ion drift at any given height. Using incoherent radar data, this procedure leads to a fast, direct numerical integration of the two coupled differential equations describing the horizontal wind components and yields time dependent wind profiles and meridional exospheric neutral temperature gradients. The diurnal behavior of the neutral wind system and of the exospheric temperature is presented for two solstice and two equinox days. The data used were obtained by the St. Santin and the Millstone Hill incoherent scatter radars. The derived geographic distributions of the exospheric temperatures are compared with those predicted by the OGO-6 empirical thermospheric model.

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