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Communication Dans Un Congrès Année : 2019

The D/H Ratio in the Martian Upper Atmosphere

Résumé

MAVEN IUVS echelle channel measurements of the H and D Lyman-alpha emissions from the upper atmosphere of Mars have been carried out since late 2014. Following a determination of the global scale patterns in temperature and atomic number density, and the application of a new asymmetric radiative transfer code, it is now possible to quote accurate values for the densities of H and D and the D/H ratio in the martian upper atmosphere. The densities of both atoms show a strong seasonal variation with a large increase during southern summer /perihelion. At this same time the D/H ratio also increases strongly compared with aphelion, when it is close to the value in lower atmospheric water. Initial thoughts on the processes responsible for this variation will be presented.
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insu-04412201 , version 1 (23-01-2024)

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John Clarke, Majd Mayyasi, Dolon Bhattacharyya, Nick Schneider, Jean-Yves Chaufray, et al.. The D/H Ratio in the Martian Upper Atmosphere. EPSC-DPS Joint Meeting 2019, Sep 2019, Geneva, Switzerland. pp.EPSC-DPS2019-868-1. ⟨insu-04412201⟩
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