Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa11a1453y&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA11A-1453
Physics
[3319] Atmospheric Processes / General Circulation, [3367] Atmospheric Processes / Theoretical Modeling, [3369] Atmospheric Processes / Thermospheric Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves
Scientific paper
In order to represent the propagation of solar tides originating from the lower atmosphere, Global Scale Wave Model (GSWM) migrating and nonmigrating diurnal and semidiurnal tidal fields are implemented at the lower boundary (~100 km) of the University of Michigan 3-D nonhydrostatic Global Ionosphere-Thermosphere Model (GITM). Under December solstice conditions of moderate solar irradiation and low geomagnetic activity, the effects on the thermosphere and ionosphere of upward propagating tidal waves are studied. Simulations obtained from different lower boundary specifications determined by GSWM and various configurations of MSIS are presented. The emphasis is put on the intercomparison of widely used MSIS (with all tidal variations) and GSWM results. Globally averaged temperature and wind fields and the associated standard deviations are evaluated in the lower thermosphere. Additionally, detailed geographical distributions and universal time (UT) variations of zonal winds and neutral temperatures are studied. Although tidal oscillations do not appear to show significant variations in globally averaged temperatures and winds, overall, there are remarkable geographical and universal time variations in the lower thermosphere between the results simulated with different lower boundary configurations. In agreement with previous studies, simulations with the GSWM lower boundary conditions suggest that the majority of upward propagating tidal oscillations propagating from below are dissipated below F region altitudes, where in-situ driven tidal oscillations start to dominate.
Hagan Maura E.
Ridley Aaron J.
Yigit Erdal
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