Infrared radiance fluctuations in the upper atmosphere

Robert L. Sundberg; John H. Gruninger; Piali De; James H. Brown

doi:10.1117/12.177922

15 June 1994 Infrared radiance fluctuations in the upper atmosphere

Robert L. Sundberg, John H. Gruninger, Piali De, James H. Brown

Proceedings Volume 2223, Characterization and Propagation of Sources and Backgrounds; (1994) https://doi.org/10.1117/12.177922
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

Simulation of infrared radiance fluctuations in the atmosphere depends on detailed descriptions of fluctuations in atmospheric species number densities, vibrational state populations, and the kinetic temperatures along the sensor line-of-sight. The relationship between kinetic and vibrational temperature fluctuations depends on the subtle interplay between changes in the total number densities, changes in the temperature-dependent kinetic rates, and the relative contribution of the radiative relaxation. The model developed in this paper predicts the two- dimensional radiance covariance function for nonequilibrium effect conditions. The radiance statistics are non-stationary and are explicitly bandpass and sensor FOV dependent. The SHARC model is used to calculate mean LOS radiance values and radiance derivatives which are necessary to determine the radiance statistics. Inputs to the model include the statistical parameters of a non-stationary atmospheric temperature fluctuation model and an atmospheric profile. The radiance statistics are used in a simple model for synthesizing images. The model has been applied to calculate the radiance structure for the OH((Delta) v equals 1) SWIR band and the CO₂((nu) ₃) MWIR band under nighttime conditions.

Citation Download Citation

Robert L. Sundberg, John H. Gruninger, Piali De, and James H. Brown "Infrared radiance fluctuations in the upper atmosphere", Proc. SPIE 2223, Characterization and Propagation of Sources and Backgrounds, (15 June 1994); https://doi.org/10.1117/12.177922

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