A Four-Year Search of Methane on Mars with ACS onboard ExoMars TGO
Résumé
The mid-infrared channel of the Atmospheric Chemistry Suite (ACS) [1] onboard ESA's Trace Gas Orbiter (TGO) has performed a sensitive search of methane in the Martian atmosphere using the solar occultation technique for more than two Mars years (four terrestrial years). The first two reports [2,3] have concluded on the global absence of methane detection above a mean level of 50 then 20 parts-per-trillion-per-volume (pptv), contrasting with the 0.4 to 45 ppbv concentrations reported from Earth-ground-observations, Mars orbiters, and from Mars' surface by the Curiosity rover [5,6,7,8,9]. Here we present an update of the ACS methane search compiling all the ACS data collected up to summer 2022.
Domaines
Planète et Univers [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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