Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41c..06c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA41C-06
Physics
[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry
Scientific paper
The properties of the O2 Atmospheric bands emitted in the lower thermosphere are examined through the use of a photochemical model and compared with measurements from the RAIDS near-infrared spectrometer on the International Space Station. An updated model (Yee, 2011) has been used to establish the sensitivity of the line-of-sight (LOS) brightness of the (0,0), (1,1) and (0,1) bands to changes in neutral composition and some reaction rate and branching ratios. We found that the most sensitive region to O2 variability is near 120 km where the brightness is ~ [O2]^2. Calculations based on the MSIS-90E neutral atmospheric model corresponding to the geographical locations of the brightness measurements at 120 and 125 km for several days of observations indicate greater variability in the model results than observed by RAIDS based on our current understanding of the pointing errors. Up to about 200 km the (0,0) band lifetime is sufficiently long to allow thermalization of the upper state through collisions with the background gasses making the rotational distribution representative of the local temperature. The analysis of rocket data by Heller et al. (1991) and more recently Sheese et al. (2010) using OSIRIS observations up to an altitude of ~ 110 km illustrates the approach. Using the same measurement concept, the RAIDS data extend the range of altitudes an additional two scale heights to approximately 130 km. Comparing RAIDS and TIMED/SABER LOS measurements we have been able to validate temperatures in the region around 100 km. During moderate geomagnetic activity (Kp ~ 4) localized but greatly enhanced temperatures have been observed. J. W. Heller, A. B. Christensen, J. H. Yee and W. E. Sharp, Mesospheric temperature inferred from daytime observation of the O2 atmospheric (0,0) band system, J. Geophys. Res., 96,19,499-19,505,1991. P. E. Sheese, E. J. Llewellyn, R. L. Gattinger, A. E. Bourassa, D. A. Degenstein, N. D. Lloyd, and I. C. McDade, Temperatures in the upper mesosphere and lower thermosphere from OSIRIS observations of O2 A-band emission spectra, Can. J. Phys. 88, 919-925, 2010. J. H. Yee, (private communication, 2011)
Bishop Richard L.
Budzien Scott A.
Christensen Andrew B.
Crowley Geoff
Hecht James H.
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