The CH₄ abundance in Jupiter’s upper atmosphere

Hydrocarbon species, and in particular CH$_4$, play a key role the stratosphere--thermosphere boundary of Jupiter, which occurs around $\mu$-bar pressure level. Previous analyses solar occultation, He Ly-$\alpha$ airglow, ISO/SWS measurements radiance 3.3 $\mu$m have inferred significantly different methane concentrations. Here we aim to accurately model CH$_4$ at measured by using comprehensive non-local thermodynamic equilibrium most recent collisional rates laboratory for shed new light onto concentration upper atmosphere Jupiter. These emission bands been shown present peak contribution precisely level, hence directly probing region interest. We find that high is necessary explain data, contrast with analyses, observations favour lower limit latest relaxation rates. Our results provide precise constraints on composition dynamics