Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1834m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1834
Physics
[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry
Scientific paper
We present global distributions of v = 9 + v = 8 nighttime vibrationally excited hydroxyl concentrations as measured by the SABER instrument on board the TIMED spacecraft. These states are formed directly by the reaction of atomic hydrogen and ozone in the terrestrial mesopause region. SABER measures the limb radiance from the delta-v = 2 transitions in a channel centered near 2.0 um, specifically the sum of the 9 -> 7 and 8 -> 6 transitions. The limb radiances are inverted to yield the volume emission rates from the sum of the v = 8 and 9 states of the hydroxyl molecule. The Einstein coefficients for spontaneous emission for these two transitions are essentially identical. Thus dividing the derived volume emission rate by the Einstein coefficient yields the absolute populations of these states (molecules per cubic cm). Nine full years of data are presented in this paper. Over this time the globally averaged OH(v = 8 + v = 9) populations have varied relative to the nine year mean by only a few percent. We conclude that despite substantial solar variability over this time period, the apparently small variation of the highly vibrationally excited hydroxyl populations implies that atomic hydrogen, atomic oxygen, temperature, and density adjust in such a way so as to keep the product of the atomic hydrogen concentration, the ozone concentration, and the rate coefficient for their reaction essentially constant.
Gordley Larry L.,
Hunt Linda A.
Marshall Benjamin T.
Mast Jeffrey C.
Mertens Chris J.
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