Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611045b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,045-11,055.
Physics
41
Planetary Temperature, Terrestrial Planets, Thermosphere, Atmospheric Temperature, Solar Cycles
Scientific paper
Global average models for the thermospheres of Venus, earth, and Mars are used here to calculate the solar cycle variations of the global mean temperature. The CO2 15 micron cooling rates for all three planets are determined. The results show that the solar cycle global mean exospheric temperature variation is about 76 K for Venus, 518 K for earth, and 110 K for Mars. A thermal balance analysis shows that the small exospheric temperature variation on Venus occurs because of the strong radiative damping by CO2 15 micron cooling. The peak CO2 cooling occurs at the altitude of maximum solar heating and efficiently radiates it to space. On earth and Mars, the increased solar heating occurs at a higher altitude than the peak in the infrared cooling. It must be thermally conducted down to the altitude of the peak infrared cooling before it is radiated to space. The CO2 cooling is not as effective on Mars as on Venus because of lower O/CO2 ratios.
Bougher Stephen W.
Roble Raymond G.
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