ISAAC measurements of MUV airglow derived from thermospheric O, N2, and NO

Details ISAAC measurements of MUV airglow derived from thermospheric O, N2, and NO ISAAC measurements of MUV airglow derived from thermospheric O, N2, and NO

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa52a0374s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA52A-0374

Physics

0310 Airglow And Aurora, 0340 Middle Atmosphere: Composition And Chemistry, 0355 Thermosphere: Composition And Chemistry

Scientific paper

We present an analysis of middle ultraviolet (MUV) spectra from the Ionospheric Spectroscopy and Atmospheric Chemistry (ISAAC) experiment in the context of our effort to obtain limb profiles of the OII 247.0 and NII 214.3~nm emissions. Measurements at these wavelengths provide a means of determining altitude profiles of thermospheric O and N2 concentrations, as well as temperatures. ISAAC was launched on the Advanced Research and Global Observing Satellite (ARGOS) in February 1999 and has provided a large data set with which to test and validate our forward models and analysis techniques. However, blending with overlapping and adjacent molecular bands of NO coupled with the ~0.4~nm spectral resolution of ISAAC makes it difficult to extract pure spectral signatures, and thus intensity profiles. This issue is particularly challenging for the 214.3~nm line, which peaks in intensity near 150~km. At and below this altitude, NO γ(1,0) band emissions become increasingly bright and interfere with our ability to obtain the full NII emission altitude profile. We have simulated these NO intensities using modeled g-factor values fit to the emission longward of 214.7~nm, where the spectral intensity is dominated by the NO emissions. The profile of each line of the doublet that comprises the 214.3~nm emission (214.4 and 213.9~nm) is then fit to the spectrum that remains after subtraction of the NO signal. We will present results from our analysis of ISAAC data and the implications for use of these emissions in remote sensing of thermospheric O and N2.

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