HR: 16:30h
AN: SA24A-03    [Abstracts]
TI: A Comparative Planetary Study: Exosphere Temperature Responses of Earth and Mars to Long-Term Solar Change
AU: * Forbes, J M
EM: forbes@colorado.edu
AF: University of Colorado, Department of Aerospace Engineering Sciences UCB429, Boulder, CO 80309, United States
AU: Lemoine, F G
EM: Frank.Lemoine@gsfc.nasa.gov
AF: NASA, Goddard Space Flight Center (GSFC), Greenbelt, MD 20771, United States
AU: Bruinsma, S L
EM: sean.bruinsma@cnes.fr
AF: Centre Nationale D'Etudes Spatiales (CNES), 18, Avenue E. Belin, Toulouse, 31401, France
AU: Smith, M D
EM: michael.d.smith@nasa.gov
AF: NASA, Goddard Space Flight Center (GSFC), Greenbelt, MD 20771, United States
AU: Zhang, X
EM: xiaoli.zhang@colorado.edu
AF: University of Colorado, Department of Aerospace Engineering Sciences UCB429, Boulder, CO 80309, United States
AB: Using densities derived from precise orbit determination of the Mars Global Surveyor (MGS) spacecraft from 1999 to mid-2005, the response of Mars' exosphere to long-term solar change is established and compared to that of Earth. At Mars, exosphere temperatures change only 36-50 percent as much as those at Earth as solar activity increases from solar minimum to solar maximum. General circulation models suggest that this difference may be strongly influenced by adiabatic cooling associated with the thermosphere general circulations. However, other processes such as differences in CO2 cooling rates may also be playing a role.
DE: 0328 Exosphere
DE: 0343 Planetary atmospheres (5210, 5405, 5704)
DE: 0358 Thermosphere: energy deposition (3369)
DE: 3369 Thermospheric dynamics (0358)
SC: SPA-Aeronomy [SA]
MN: 2007 Fall Meeting