Thermospheric dynamics during September 18-19, 1984. I - Model simulations

Details Thermospheric dynamics during September 18-19, 1984. I - Model simulations Thermospheric dynamics during September 18-19, 1984. I - Model simulations

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9416925c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 16925-16944.

Physics

72

Atmospheric General Circulation Models, Equinoxes, Magnetic Storms, Polar Regions, Thermosphere, Three Dimensional Models, Convection, Particle Precipitation, Spatial Distribution, Temperature Distribution, Time Dependence, Wind Profiles

Scientific paper

The September 18-19, 1984 Equinox Transient Study (ETS) interval was simulated using the National Center for Atmospheric Research thermospheric GCM with inputs guided by observations. High-latitude forcings for the model were defined with precision for this period. The importance of upward-propagating semidiurnal tides is emphasized, the first-realistic time-dependent simulation to incorporate such tides. A description of the simulated quiet time thermospheric structure for September 18 is contrasted with the storm time behavior of September 19. Several features of the storm response are described, including the generation of large-scale equatorward propagating disturbances. Longer-lived perturbations of the neutral temperature and composition are also discussed. A new feature discovered in the model predictions for altitudes around 200 km comprises a quasi-fixed, four-cell pattern of high-and low-density regions in the polar cap.

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