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| Titel |
HALESIS projet: Hight Altitude Luminous Events Studied by Infrared Spectro-imagery |
| VerfasserIn |
Laurence Croizé, Sebastien Payan, Jérôme Bureau, Fabrice Duruisseau, Nathalie Huret |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250097022
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| Publikation (Nr.) |
 EGU/EGU2014-12559.pdf |
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| Zusammenfassung |
| During the last two decades, the discovery of transient luminous events (TLEs) in the high
atmosphere [1], as well as the observation of gamma ray flashes of terrestrial origin
(Terrestrial Gamma Flashes or TGF) [2] demonstrated the existence of another interaction
processes between the different atmospheric layers (troposphere, stratosphere, mesosphere
and ionosphere). Indeed, the frequency of occurrence of these phenomena over thunderstorm
cells, and the energies involved provide evidence for an impulsive energy transfer
between the troposphere and the highest atmospheric layers, which was not considered
before.
HALESIS (High Altitude Luminous Events Studied by Infrared Spectro-imagery) is an
innovative project based on hyperspectral imagery. The purpose of this experience is to
measure the atmospheric perturbation in the minutes following the occurrence of
Transient Luminous Events (TLEs) from a stratospheric balloon in the altitude
range of 20 to 40 km. The first part of the study has been dedicated to establish the
project feasibility. To do that, we have simulated spectral perturbation induced
by an isolated blue jet. Theoretical predictions [3] have been used to simulate the
radiative perturbation due to O3, NO, NO2, NO+ concentration induced by the blue jet.
Simulations have been performed using the line by line radiative transfer model
LBLRM [4] taking into account of the Non Local Thermodynamic Equilibrium
hypotheses. Then, the expected signatures have been compared to the available
instrumentation.
During this talk, HALESIS project and the results of the feasibility study will be
presented. Then, the estimated spectral signatures will be confronted with the technical
capabilities of different kind of hyperspectral imagers. We will conclude on the project
feasibility, but also on the challenges that lie ahead for an imager perfectly suited for
experiences like HALESIS.
1. Franz R, Nemzek R, Winckler J. Television image of a large upward electrical
discharge above a thunderstorm system. Science 1990,249:48-51.
2. Fishman GJ, Bhat P, Mallozzi R, Horack J, Koshut T, Kouveliotou C, et al. Discovery
of intense gamma-ray flashes of atmospheric origin: National Aeronautics and Space
Administration; 1994.
3. Duruisseau Fabrice, Huret N. Private communication In.
4. Clough SA, Iacono MJ, Moncet JL. Line-by-line calculations of atmospheric fluxes
and cooling rates: Application to water vapor. Journal of Geophysical Research: Atmospheres
(1984–2012) 1992,97:15761-15785. |
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