The case for a compact methane cloud on Uranus based on a reanalysis of the Voyager 2 radio occultation and STIS spectra.

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A localized refractivity slope variation near 1.2 bars in the Voyager 2 radio occultation profile of Uranus was interpreted by Lindal et al. [4] to be the result of a condensed methane cloud layer. However, models fit to near-IR spectra found particle concentrations much deeper in the atmosphere, in the 1.5-3 bar range [5, 6, 2] and a recent analysis of STIS spectra argued for a model in which aerosol particles formed diffusely distributed hazes, with no compact condensation layer [3]. To try to reconcile these results, we reanalyzed the occultation observations with the He volume mixing ratio reduced from 0.15 to 0.116, which is near the edge of the 0.033 uncertainty range given by Conrath et al.[1], then also applied constraints provided by STIS spectral observations [3].

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