Modélisation des propriétés statistiques de la luminance infrarouge du fond de ciel observée au limbe depuis la stratosphère

Carine Quang 1, 2
1 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Airborne IR surveillance systems are used to detect ballistic missiles but their performances are limited by the atmospheric background heterogeneities. This thesis offers a new code, FACLUM-2D, which computes the 2D atmospheric radiance fluctuations autocorrelation function (ACF) for airborne configurations and adapted to the thermal IR. In these conditions, the clear-sky atmospheric structures result mainly from local fluctuations in temperature and in water vapor mass fraction. FACLUM-2D is then the first model which takes into account the water vapor contribution. In addition, the radiance ACF calculation depends on the absorption coefficient and its derivative with respect to the temperature and to the water vapor mass fraction. Therefore, I have developed a line by line code, RPR-IRT, dedicated to the thermal IR, which tabulate these derivatives, with a spectral resolution of 10-4 cm-1. Lack of experimental measurement available in the litterature, FACLUM-2D has been partially validated against analytical solutions for a homogeneous and gray medium and compared, as far as possible, to standard radiative transfer codes. First results show, for the first time, that water vapor mass fraction fluctuations impact strongly on radiance fluctuations. In the future, it could be interesting to extend FACLUM-2D to a larger spectral domain, so as to cover the whole IR region.
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Carine Quang. Modélisation des propriétés statistiques de la luminance infrarouge du fond de ciel observée au limbe depuis la stratosphère. Océan, Atmosphère. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00511732⟩

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