Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa22a..09k&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SA22A-09
Physics
3332 Mesospheric Dynamics, 0310 Airglow And Aurora, 0340 Middle Atmosphere: Composition And Chemistry, 0355 Thermosphere: Composition And Chemistry
Scientific paper
The HRDI instrument aboard the UARS satellite was run in the ``airglow imaging" night-side mode from March 1996 through January 2000 to map the emission brightness of the O2(0-0) Atm nightglow at high spatial resolution over much of the globe. A single 24-hour composite image typically yields complete longitudinal coverage for 85-95% of the areal extent in at least one of the two hemispheres. Only the polar cap regions poleward of 72° latitude are not observed with this HRDI airglow imaging mode. Model predictions of the O2(0-0) Atm brightness made by the TIME-GCM 1993 annual run with realistic seasonal forcing and constant solar inputs are used to derive a simple ratio between the rate of atomic oxygen recombination and the molecular oxygen nightglow brightness. This relationship allows the global distribution of atomic oxygen recombination to be inferred from the HRDI nightglow images, which exhibit highly structured patterns of brightness variations in longitude and latitude. Daily values of the hemispheric areal mean brightness computed from the HRDI images are found to vary semiannually, with minima at solstice and maxima a few weeks after equinox. In both hemispheres, the autumnal peak is brighter than the vernal peak. This observed seasonal pattern is compared with the TIME-GCM results. The atomic oxygen content of the thermospheric reservoir is derived from both the TIME-GCM and NRLMSISE-00 models to determine whether variations in the source of atomic oxygen or wave-driven modulations in the balance of photochemical reactions producing the O2(1Σ ) state are responsible for the observed seasonal cycle in the molecular oxygen nightglow.
Hays Paul B.
Kafkalidis Julie F.
Roble Raymond G.
Skinner Wilbert R.
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