Rotational and Spin-Orbit Distributions of NO Observed by MIPAS/ENVISAT Under Auroral and Quiescent Conditions

Details Rotational and Spin-Orbit Distributions of NO Observed by MIPAS/ENVISAT Under Auroral and Quiescent Conditions Rotational and Spin-Orbit Distributions of NO Observed by MIPAS/ENVISAT Under Auroral and Quiescent Conditions

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa43a..03g&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA43A-03

Physics

0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0355 Thermosphere: Composition And Chemistry

Scientific paper

5.3 μm emission from nitric oxide was observed by the MIPAS instrument on board the ENVISAT satellite under auroral and quiescent conditions in 2003. The very high spectral resolution of the instrument (0.035 cm-1 unapodized) permits detailed study of the rotational and spin-orbit distributions of NO in the upper atmosphere. Spectral modeling of the NO(Δv = 1) fundamental band emissions was performed and compared with the results of a non-LTE atmospheric model. In the MIPAS data taken during the October/November solar storm, strong NO signal levels and increased rotational temperatures indicated high levels of auroral activity. The two primary sources of NO(v = 1) in the thermosphere are the collisional excitation of NO(v = 0) by O atoms and the chemical reactions of N(4S) and N(2D) atoms with O2. Auroral activity leads to increased production of N(4S) and N(2D) atoms, resulting in enhanced chemical formation of NO. The NO(v = 1) spin-orbit distributions were found to be subthermal for all measurements. Variations in the NO spin-orbit ratios indicate that NO(v = 1) produced by N + O2 has a hotter spin-orbit distribution than NO(v = 1) produced by O atom collisional pumping. Spin-orbit relaxation is slower than rotational relaxation, and therefore the NO spin-orbit ratio may be useful as a signature of the NO formation mechanism.

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