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Theses

Etude de l'atmosphère profonde de Jupiter

Abstract : The goal of this thesis is the study of the Jupiter's troposphic chemical species spatial repartition, with an emphasis on NH3. Two types of data were used: ground-based observations with the TEXES instrument mounted on the IRTF, and space-based observations with the JIRAM instrument mounted on the JUNO spacecraft. The data were analysed by a parallelised code developped during this thesis, combining a line-by-line radiative transfer and an optimal non-linear retrieval method.The TEXES data were used to draw a map of the tropospheric NH3 (between 1 and 4 bar) with an uncertainty of 20% on three quarters of Jupiter's surface with a spatial reslution of approximately 1200 km (1.4"). This map highlight important latitudinal variations of the tropospheric NH3, which can vary from 60 ppmv near the hotspots of the NEB, to more than 500 ppmv into the zones. However, the results in the zone have a low signal-to-noise ratio, increasing their uncertainties. The map also highlight longitudinal variations, particularly in the SEB. These results are in good agreement with those of JIRAM and MWR (another instrument of JUNO), albeit an important discrepancy with MWR's results in the NEZ.
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  • HAL Id : tel-02117686, version 1

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Doriann Blain. Etude de l'atmosphère profonde de Jupiter. Astrophysique [astro-ph]. Université Paris sciences et lettres, 2018. Français. ⟨NNT : 2018PSLEO014⟩. ⟨tel-02117686⟩

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