Re-analysis of HST/STIS Lyman-alpha data shows no localized H2O aurora on Europa; a global H exosphere is present with temperature ~1000 K, column density 1.4e12 cm^{-2}, and source rate 1.1e27 s^{-1}.
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Europa's Lyman-$\alpha$ emissions from HST/STIS observations
Re-analysis of HST/STIS Lyman-alpha data shows no localized H2O aurora on Europa; a global H exosphere is present with temperature ~1000 K, column density 1.4e12 cm^{-2}, and source rate 1.1e27 s^{-1}.