Model simulation of the response of thermosphere and ionosphere to subauroral polarization streams (SAPS)

Details Model simulation of the response of thermosphere and ionosphere to subauroral polarization streams (SAPS) Model simulation of the response of thermosphere and ionosphere to subauroral polarization streams (SAPS)

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41b1864w&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA41B-1864

Other

[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics, [2447] Ionosphere / Modeling And Forecasting

Scientific paper

An empirical model of subauroral polarization streams (SAPS) has been incorporated into the Thermosphere Ionosphere Electrodynamics General Circulation Model (TIEGCM). This SAPS driven TIEGCM is used to simulate the effect of SAPS on the global thermosphere and ionosphere during a geomagnetically active period between day of year (DOY) 329 and 333 in 2008. Our results show that SAPS caused an increase in global thermospheric temperature which became stronger with time. This neutral temperature increase was more significant at high latitudes in subauroral and auroral regions. Joule heating by SAPS and the resulted adiabatic heating and cooling of the thermosphere was the primary mechanism for the simulated neutral temperature changes. The strong ion drag effect in the subauroral SAPS channel drove large changes in thermospheric winds. Neutral zonal winds had either an extra, separate channel of westward flow in the subauroral region in the afternoon-midnight sector or a broad westward wind jet that merged with the regular duskside auroral westward neutral zonal wind driven by the high latitude convection pattern. The response of neutral temperature and wind to SAPS was more significant at higher altitudes and exhibited seasonal/hemispheric asymmetry. The heating to the thermosphere by SAPS also resulted in changes in thermospheric composition with upwelling of molecular rich air from lower altitudes in subauroral and auroral regions and downwelling of atomic rich air at other latitudes. These changes in thermospheric composition contributed to the deeper and more extended ionospheric electron density depletions in subauroral regions, as well as electron density increases along the equatorward edge of the SAPS channel in the afternoon sector. Ionospheric electron density also increased at high latitude around noon which was probably the result of the concentration of plasma flux tubes in the convection entrance region by the imposed extra sunward ion drifts of SAPS.

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