The Terrestrial O2(1delta) 1.27 micron Airglow Emissions

Details The Terrestrial O2(1delta) 1.27 micron Airglow Emissions The Terrestrial O2(1delta) 1.27 micron Airglow Emissions

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0295s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0295

Physics

0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

The O2(1Δ) 1.27 micron emission is one of the brightest airglow emissions observed in the Earth airglow spectrum and provides an ideal light source for passively sensing the atmosphere. It is known that the excited O2(1Δ) molecules in the daytime are produced by ozone photolysis by solar UV radiation. Its measured emission rates have thus been used to obtain the abundances of ozone. The exact night time excitation mechanisms, however, are still not well-understood. However, atomic oxygen recombination and oxidation of vibrationally excitation OH have been proposed. Observations by instruments onboard TIMED have provided a unique opportunity to examine the spatial and temporal morphology of this emission and its excitation mechanisms. We will use the O2(1Δ) and OH(v) measurements by SABER and O2(1Σ) measurements by TIDI to investigate the O2(1Δ) excitation mechanisms. In addition, because of its relatively long chemical relaxation time, the O2(1Δ), could potentially not be in the steady-state chemical balance. In this paper, we will discuss the importance of this effect and its impact on the utility of this emission for composition retrievals (i.e. ozone and atomic oxygen).

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