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Orbital apocenter is not a sufficient condition for HST/STIS detection of Europa's water vapor aurora

Nimmo, Francis; Saur, Joachim; Roth, Lorenz +4 more

We report far-ultraviolet observations of Jupiter's moon Europa taken by Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope (HST) in January and February 2014 to test the hypothesis that the discovery of a water vapor aurora in December 2012 by local hydrogen (H) and oxygen (O) emissions with the STIS originated from plume a…