The spatial structure and temporal variability of Ganymede’s auroral ovals from Hubble Space Telescope observations
Published in: Magnetospheres of Outer Planets meeting (MOP) 2015, June 1-5, Georgia Institute of Technology, Atlanta, Georgia, USA, Oral presentation, 2015
Type: Oral Presentation
Fabrizio Musacchio, Joachim Saur, Lorenz Roth, Kurt D. Retherford, Paul D. Feldman, Melissa A. McGrath, Darrell F. Strobel, Stefan Duling, "The spatial structure and temporal variability of Ganymede’s auroral ovals from Hubble Space Telescope observations" (2015). Magnetospheres of Outer Planets meeting (MOP) 2015, June 1-5, Georgia Institute of Technology, Atlanta, Georgia, USA, Oral presentation,
We investigate properties of Ganymede’s OI 1356 Å and OI 1304 Å auroral ovals using spectral images acquired during the past two decades with Hubble’s Space Telescope Imaging Spectrograph (HST/STIS). The observations cover the leading and trailing side of Ganymede. We analyze the spatial and temporal variability of the brightness and the structure of the auroral ovals as a function of Ganymede’s magnetic latitude and orbital elongation. The investigation of the aurora is a diagnostic tool of the various processes that contribute to Ganymede’s complex magnetic field environment. We find both spatial inhomogeneities as a function of planetary longitude and temporal variation as a function of Ganymede’s position relative to the current sheet in Jupiter’s magnetosphere.
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