Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa51a0779s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA51A-0779
Other
0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics, 2459 Planetary Ionospheres (5435, 5729, 6026, 6027, 6028), 3369 Thermospheric Dynamics (0358)
Scientific paper
The planetary ionospheres and thermospheres often show very complicated structures and dynamics. The ionosphere and the thermosphere are controlled by a number of variable processes such as solar EUV radiation, interactions with the solar wind and the magnetosphere, particle precipitation, Joule heating, and various kinds of waves propagating from the lower atmosphere. The ionosphere and the thermosphere are also strongly coupled with each other through chemical reactions and transfer of momentum and energy via collisions. Although average or typical global structures of the ionosphere and thermospheres are understood fairly well, small-scale variations in the planetary ionospheres and thermospheres have not been fully understood even at the Earth. Thanks to rapid progress of measurement techniques of the upper atmosphere from the ground and from satellites, it is now possible to quantitatively measure the mesoscale dynamics of the terrestrial ionosphere and thermosphere. Recent observations have suggested that the mesoscale phenomena might have significant influences on the global structure and dynamics of the upper atmosphere. Although quality and amount of data of the upper atmosphere are still not enough to investigate mesoscale phenomena for Venus and Mars, it is expected that more and better data will be obtained in the near future. Therefore, it is now a good time to start comparative studies of the planetary ionospheres and thermospheres. In addition to observations, it is also important to develop high-resolution ionosphere-thermosphere models of the planets. In this paper, a few small-scale ionosphere-thermosphere coupling processes at the planets are reviewed. Numerical models to study those processes are also presented and discussed.
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