Simulation de la signature infrarouge des phénomènes lumineux transitoires en moyenne atmosphère

Abstract : Even if it hasn’t been observed yet, the existence of emissions in the middle and far infrared following a sprite is suspected and could be related to vibrational excitation of CO2. In atmospheric sciences, the chemical composition can be retrieved through different remote sensing methods. For the Defense, natural infrared emissions could cause false alarms through airborne and spaceborne optronic detection systems. That is why it is necessary to characterize the infrared emissions of sprites. To do so, a plasma-vibrational kinetic model has been developed and coupled to an atmospheric radiative transfer model. This model allows evaluating the energetic and chemical effects following the electrical perturbation caused by the propagation of streamers, main constituent elements of sprites. The evaluated signatures could be detectable for an observer situated in the stratosphere or in space. Otherwise, the effects of the uncertainties on the principal parameters of the model have been quantified through a sensitivity analysis. Finally, this work allowed defining instrumental specifications for the future mission HALESIS (High Altitude Luminous Events Studied by Infrared Spectro-imagery), which will record hyperspectral infrared images of sprites and other middle atmosphere luminous events.
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Frédéric Romand. Simulation de la signature infrarouge des phénomènes lumineux transitoires en moyenne atmosphère. Vibrations [physics.class-ph]. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS091⟩. ⟨tel-01969510v2⟩

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