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Published October 18, 1996 | public
Journal Article

Time-Resolved Observations of Jupiter's Far-Ultraviolet Aurora


Simultaneous imaging and spectroscopic observations of Jupiter's far-ultraviolet aurora covering half a jovian rotation were made on 31 May 1994. The Hubble Space Telescope Wide Field Planetary Camera 2 images revealed dramatic and rapidly changing auroral features, including discrete longitudinal structures along the auroral ovals, with variable contrast; a poleward offset in a north oval sector, showing equatorward motion near dusk; emissions polewards of the ovals, apparently co-rotating; and a bright event developing near the dawn limb. Viewing geometry effects explain the rotational intensity modulation observed by the International Ultraviolet Explorer, without intrinsic longitudinal asymmetries.

Additional Information

© 1996 American Association for the Advancement of Science. Received 12 July 1996; accepted 26 September 1996. We are grateful to A. Storrs at the Space Telescope Science Institute (STScl) for his efforts in scheduling these WFPC2 GTO observations and to B. McColl um and the IUE staff at Goddard Space Flight Center for scheduling and execution of the IUE observations on short notice. G.E.B. is also grateful to I. Engle, F. Bagenal, L. Ben Jaffel, R. Thorne, D. Rego, R. Clauer, and A. Ridley for helpful conversations; K. Khurana for providing the Galileo data; and the referees for helpful suggestions. This research was supported by the Jet Propulsion Laboratory 959122 and NASA ADP NAG5-3044 grants to the University of Michigan. This work was based on observations with the NASA-European Space Agency HST, obtained at the STScl, which is operated by the Association of Universities for Research in Astronomy for NASA under contract NAS5-26555.

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August 19, 2023
October 19, 2023