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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Empirical release rates for [O I] better match direct CO2 measurements in the comet observed near solar maximum than in the one near solar minimum.
citing papers explorer
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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}.
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Observations of [O I] emission in Comets C/2014 Q2 (Lovejoy) and C/2007 N3 (Lulin): Possible Influence of Solar Activity on Oxygen Line Ratios
Empirical release rates for [O I] better match direct CO2 measurements in the comet observed near solar maximum than in the one near solar minimum.