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Simultaneous Chandra X ray, Hubble Space Telescope ultraviolet, and Ulysses radio observations of Jupiter's aurora
MacDowall, R. J.; Waite, J. H.; Cravens, T. E. +8 more
Observations of Jupiter carried out by the Chandra Advanced CCD Imaging Spectrometer (ACIS-S) instrument over 24-26 February 2003 show that the auroral X-ray spectrum consists of line emission consistent with high-charge states of precipitating ions, and not a continuum as might be expected from bremsstrahlung. The part of the spectrum due to oxyg…
A self-consistent model of plasma and neutrals at Saturn: Neutral cloud morphology
Jurac, S.; Richardson, J. D.
We present a model of the plasma and neutral environment that treats plasma and neutrals self-consistently, using Voyager plasma and ultraviolet H observations and Hubble Space Telescope OH measurements as constraints. The neutral distributions are determined with a Monte Carlo model, and the plasma distributions are determined with a diffusive tr…
Variable morphology of Saturn's southern ultraviolet aurora
Clarke, J. T.; Cowley, S. W. H.; Bunce, E. J. +2 more
The Space Telescope Imaging Spectrograph camera on board Hubble Space Telescope obtained 68 FUV images of Saturn's southern auroral emission between 8 and 30 January 2004, during Cassini's approach to Saturn's magnetosphere. The HST observations took place in four different solar wind regimes with a low-field rarefaction region from 8 to 16 Januar…
Open flux estimates in Saturn's magnetosphere during the January 2004 Cassini-HST campaign, and implications for reconnection rates
Milan, S. E.; Badman, S. V.; Clarke, J. T. +4 more
During 8-30 January 2004, a sequence of 68 UV images of Saturn's southern aurora was obtained by the Hubble Space Telescope (HST), coordinated for the first time with measurements of the upstream interplanetary conditions made by the Cassini spacecraft. Using the poleward edge of the observed aurora as a proxy for the open-closed field line bounda…
Signature of Saturn's auroral cusp: Simultaneous Hubble Space Telescope FUV observations and upstream solar wind monitoring
Cowley, Stanley W. H.; Bunce, Emma J.; Clarke, John T. +3 more
Model simulations by Bunce et al. (2005a) have shown that direct precipitation of electrons in Saturn's dayside cusp regions is not capable of producing significant FUV aurora. Instead, they suggested the possibility that the FUV bright emissions sometimes observed near noon are associated with reconnection occurring at the dayside magnetopause, p…