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Communication Dans Un Congrès Année : 2021

HALESIS-Sat : Physical And Technical Feasibility To Observe Infrared Vibrational Signatures Of TLEs From Space.

Résumé

Impact of Transient luminous phenomena (TLEs) on the local atmospheric composition, the vibrational chemistry they induce, and the associated energy deposition remain open questions. A number of studies, validated by ground, airborne and space observation campaigns, attribute the radiation of the sprites to the excitation of the electronic levels of N2 and N2+. However, the radiation due to the excited levels of CO2 molecules, envisioned by various authors and which would persist much longer after the advent of the sprite has never been measured to date. The thesis work of Frédéric Romand (Sorbonne Université) demonstrated that the infrared signature of CO2 could be observed either from a stratospheric balloon or from space. This open the way to observe influence of sprites on CO2 by spectroscopy. Since this influence can itself be a function of space, we would also like to spatially resolve the signature, which directs the choice of instrumentation towards a spectro-imager. As the observed phenomenon evolves rapidly, it is necessary to have a "snapshot" acquisition, that is to say that the hyperspectral cube (2 dimensions for space, one spectral dimension) can be taken instantaneously. Most spectro-imagers are scanning and therefore not suitable for the needs of the experiment. However, ONERA is currently developing a new type of spectro-imager called ImSpoc that would meet these needs. The sprite observation can be done from two angles: aiming at the horizontal limb, or aiming, vertically downwards. We will discuss a satellite approach and the main advantages (longer mission, global coverage), and we will present the feasibility of such an experiment, on two major aspects: Physical feasibility: is the phenomenon observable from space for the proposed instrumentation? (Frequency of events, signal-to-noise ratio, sensitivity of measuring devices, etc.) Technical feasibility: can a satellite fulfill this mission? (Energy consumption, data transmission, etc.)
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Dates et versions

insu-04518951 , version 1 (24-03-2024)

Identifiants

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Sébastien Payan, Laurence Croize, Florence de La Barriere, Frederic Romand, Yann Ferrec, et al.. HALESIS-Sat : Physical And Technical Feasibility To Observe Infrared Vibrational Signatures Of TLEs From Space.. AGU Fall Meeting 2021, Dec 2021, New Orleans, United States. pp.AE34A-08. ⟨insu-04518951⟩
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