Other
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3501201f&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 1, CiteID L01201
Other
7
Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Atmospheric Composition And Structure: Pressure, Density, And Temperature, Atmospheric Composition And Structure: Exosphere, Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Atmospheric Processes: Thermospheric Dynamics (0358)
Scientific paper
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 and Venus. At Mars, exosphere temperatures (weighted towards high-latitude Southern Hemisphere daytime conditions) change only 36-50% as much as those at Earth as solar activity increases from solar minimum to solar maximum, whereas the response at Venus is one-fifth that at Mars. General circulation models suggest that this difference may be strongly influenced by adiabatic cooling associated with the thermosphere general circulation. However, other processes such as differences in CO2 cooling rates may also be playing a role.
Bruinsma Sean L.
Forbes Jeffrey M.
Lemoine Frank G.
Smith Michael D.
Zhang Xiaoli
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