Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p32a..02k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P32A-02
Physics
0343 Planetary Atmospheres (5210, 5405, 5704), 0350 Pressure, Density, And Temperature, 0355 Thermosphere: Composition And Chemistry, 5210 Planetary Atmospheres, Clouds, And Hazes (0343), 5405 Atmospheres (0343, 1060)
Scientific paper
The accelerometer experiment facility aboard Mars Reconnaissance Orbiter (MRO) obtained neutral density measurements and inferred temperature measurements 100km to 170km over the entire Southern Hemisphere of Mars in 2006. When combined with our previous accelerometer experiments on Mars Global Surveyor and Mars Odyssey, global measurements are obtained showing variations with latitude, seasons, day/night, aphelion/perihelion, and solar activity. The measurements also show a stability of climatology when compared with MEX Stellar Occultation measurements. Temperatures are found to be fairly constant within 40° latitude of the equator rising with altitude due to solar euv radiation absorption at higher altitudes. Exospheric temperatures are discovered to be near 130 K on the nightside (3am) and near 200K on the dayside (3pm). MTGCM models are about the same as observed at night, but somewhat warmer than observed on the dayside. The cooler dayside observations may indicate somewhat less atmospheric escape than the MTGCM temperatures would predict. We have discovered winter polar warming in the lower thermosphere from the accelerometer measurements. Apparently, meridional flow from the summer to winter hemisphere results in strong adiabatic heating near the winter pole causing the warming. This effect is stronger at winter North Pole than winter South Pole apparently due to the planet being near perihelion at North Pole winter.
Bougher Stephen W.
Keating Gerald M.
Theriot M. E.
Tolson Robert H.
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