High-Altitude Non-Equilibrium Infrared Emission Models
Final rept. 11 Jun 1986-30 Nov 1990
ARCON CORP WALTHAM MA
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This report describes the development and implementation of models for predicting infrared emission in non-LTE regions of the Earths atmosphere. Such models are used to stimulate particular atmospheric conditions, both quiescent and aurorally-distributed, in order to extract information from infrared radiance data sets and study the roles of different basic physical processes affecting the upper atmosphere. Specifically, developed is the first line-by-line radiative excitation model for the upper atmosphere, RAD, applied it to the calculation of populations of infrared-active states of CO2 and CO, simulated the conditions of the SPIRE experiments, and elucidated the role of atomic oxygen in exciting the CO2 bending modes. Auroral emissions are modeled and the Field Widened Interferometer data set analyzed using a method of spectral decomposition, and NO band heads identified in the lower-thermosphere emissions. Described are the mathematical procedures underlying the model, especially the RAD model, and the physical process incorporated in them. Results are presented from running the models.
- Atmospheric Physics