Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusm.a44a..01f&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #A44A-01
Physics
3332 Mesospheric Dynamics, 3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves
Scientific paper
The main point of my talk is to demonstrate that the surface properties of Earth and Mars strongly influence the zonal structures of their thermospheres, more than 100 km overhead. This happens through longitudinal modulation of solar thermal tide excitation near the surface, whereupon the tides propagate vertically, grow exponentially, and impose the same zonal asymmetry on the thermosphere. On Earth, diurnally-varying solar radiation sweeping over the wave-4 land sea distribution leads to evaporation and (ultimately) latent heating that strongly excites the eastward-propagating diurnal tide with zonal wavenumber s = - 3 (DE3). On Mars, the strong wave-2 topography, vis-a-vis the kinematic boundary condition, similarly excites the s = -1 eastward-propagating diurnal tide (DE1), which is in near-resonance on Mars. In the thermosphere, when viewed in a Sun-synchronous frame, DE3 and DE1 appear as wave-4 and wave-2 longitudinal variations, the same zonal wavenumbers characterizing the surfaces of Earth and Mars, respectively. Implications for modulation of Earth's ionosphere, and the aerobraking region of Mars, are also presented.
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