Impact of non-hydrostatic processes on the thermospheric density and winds

Details Impact of non-hydrostatic processes on the thermospheric density and winds Impact of non-hydrostatic processes on the thermospheric density and winds

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21b1558d&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA21B-1558

Physics

0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 2407 Auroral Ionosphere (2704), 2427 Ionosphere/Atmosphere Interactions (0335), 2753 Numerical Modeling

Scientific paper

One common assumption used in many theoretical thermosphere/ionosphere models is hydrostatic equilibrium, under which the pressure gradient force is balanced with the gravity force in the vertical direction. This assumption represents the large-scale atmosphere behavior very well, but on small spatial scales and during short time periods, the system can be non-hydrostatic. Non-hydrostatic processes can cause large vertical winds and strong disturbances of neutral density in the upper atmosphere. It is currently unknown what are the global ramifications of the non-hydrostatic processes. Comparison between the non- hydrostatic Global Ionosphere Thermosphere Model (GITM) and the hydrostatic Coupled Thermosphere Ionosphere Plasmasphere model (CTIP) helps us to quantify the non-hydrostatic coupled response of the system to strong driving. Specifically, the investigation begins with turning off all non-hydrostatic terms in GITM and forcing hydrostatic equilibrium at each time-step. The results are compared with a CTIP simulation to show the effects of model differences. The non-hydrostatic terms then are added back in GITM and the results are compared with CTIP again to determine their relative contributions. The simulation results are also compared with ground-based and satellite measurements of the neutral density and winds.

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