Thermospheric dynamics during September 18-19, 1984. II - Validation of the NCAR thermospheric general circulation model

Details Thermospheric dynamics during September 18-19, 1984. II - Validation of the NCAR thermospheric general circulation model Thermospheric dynamics during September 18-19, 1984. II - Validation of the NCAR thermospheric general circulation model

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9416945c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 16945-16959. Research supported by NSF.

Physics

47

Atmospheric General Circulation Models, Equinoxes, Numerical Weather Forecasting, Thermosphere, Wind Measurement, Convection, F Region, Ionospheric Heating, Particle Precipitation, Polar Regions, Temperature Gradients, Wind Profiles

Scientific paper

The winds, temperatures, and densities predicted by the thermospheric GCM are compared with measurements from the Equinox Transition Study of September 17-24, 1984. Agreement between predictions and observation is good in many respects. The quiet day observations contain a strong semidiurnal wind variation which is mainly due to upward-propagating tides. The storm day wind behavior is significantly different and includes a surge of equatorward winds due to a global propagating disturbance associated with the storm onset. A quantitative statistical comparison of the predicted and measured winds indicates that the equatorward winds in the model are weaker than the observed winds, particularly during storm times. A quiet day phase anomaly in the measured F region winds which is not reproduced by the model suggests the occurrence of an important unmodeled interaction between upward propagating semidiurnal tides and high-latitude effects.

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