Highly rotationally excited NO(upsilon, J) in the thermosphere from CIRRIS 1A limb radiance measurements

Details Highly rotationally excited NO(upsilon, J) in the thermosphere from CIRRIS 1A limb radiance measurements Highly rotationally excited NO(upsilon, J) in the thermosphere from CIRRIS 1A limb radiance measurements

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2425a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 22, p. 2425-2428

Physics

33

Dayglow, Emission Spectra, Excitation, Infrared Spectra, Nitric Oxide, Radiance, Thermosphere, Atmospheric Chemistry, Energy Budgets, Kinetics, Least Squares Method, Space Shuttle Payloads, Space Shuttles, Spectrum Analysis

Scientific paper

Earthlimb spectra of thermospheric NO fundamental band emissions, obtained in the Cryogenic Infrared Radiance Instrumentation for Shuttle (CIRRIS) 1A Space Shuttle experiment, have been analyzed using nonlinear least-squares spectral fitting. Absolute NO(upsilon equal to or greater than 1, J) column densities have been determined in the 100 to 260-km tangent height region and inverted to yield altitude-dependent number densities for both a rotationally thermalized and a highly rotationally excited population component. Emissions from high-J levels are predicted to dominate the delta upsilon = 2 overtone bands during the daytime. The rotationally excited population is found to decrease more at night than the rotationally thermalized component. In addition, radiance from the CO upsilon = 1 aproaches 0 fundamental band is observed in the NO R-branch band head region, with greater relative importance at night. The derived CO rotaional temperatures are significantly greater than modeled local kinetic temperatures. These results provide important inputs to models of NO(upsilon, J) formation mechanisms, and of the chemistry, radiative processes, and energy budget of the thermosphere.

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