Dependence of the High-Latitude Lower Thermospheric Momentum Forcing on the Interplanetary Magnetic Field

Details Dependence of the High-Latitude Lower Thermospheric Momentum Forcing on the Interplanetary Magnetic Field Dependence of the High-Latitude Lower Thermospheric Momentum Forcing on the Interplanetary Magnetic Field

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13a0268k&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA13A-0268

Physics

0358 Thermosphere: Energy Deposition (3369), 2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics, 2475 Polar Cap Ionosphere, 3369 Thermospheric Dynamics (0358)

Scientific paper

At high latitudes the thermospheric winds are strongly influenced by energy and momentum sources associated with magnetosphere-ionosphere coupling, such as the magnetospheric convective electric field and the precipitation of energetic electrons and ions into the auroral regions. The wind patterns in the high-latitude lower thermosphere depend on the direction of the IMF, indicating that the forcing also varies with respect to the direction of the IMF. In this study, to understand the physical processes that control the high-latitude lower thermospheric dynamics (below 170 km) with respect to the direction of the IMF, we quantify the forces responsible for maintaining the wind system in the southern hemisphere as a function of the IMF orientation. We analyze steady-state forcing for different IMF directions, for summer conditions, based on simulations with the National Center for Atmospheric Research Thermosphere-Ionosphere Electrodynamics General Circulation Model (NCAR TIE-GCM).

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