Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p14b..07m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P14B-07
Physics
[0310] Atmospheric Composition And Structure / Airglow And Aurora, [2704] Magnetospheric Physics / Auroral Phenomena, [2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [6222] Planetary Sciences: Solar System Objects / Ganymede
Scientific paper
Jupiter's largest satellite Ganymede is unique because it possesses an internal magnetic field strong enough to create a small magnetosphere around the satellite.The interaction between Ganymede's magentosphere and the Jovian magnetic field and magnetospheric plasma generates classic polar auroral emissions from Ganymede which have been captured in a series of stunning ultraviolet images using the Hubble Space Telescope on four different dates from 1998 to 2007. Only data from the first set of obserations in 1998 has been published (Feldman et al. 2000; Eviatar et al. 2001). We have used a common data reduction process on all four sets of images, and combined them to produce a near global map of the locatoin of Ganymede's auroral oval, which appears to be relatively stable in the seven years spanning the observations. We compare the location of this auroral oval with several model predictions of the boundary between open and closed magnetic field lines (Koop and Ip 2002; Khurana et al. 2007; Jia et al. 2009), a region where strong field aligned currents are thought to produce the auroral emissions. We also compare the location of the auroral emission with the polar cap boundary on Ganymede as dlineated by color ratio images acquired by the Galileo mission (Khurana et al. 2007). [The figure below shows Ganymede's auroral oval emission from the trailing hemisphere of the satellite, which is the downstream hemisphere relative to the plasma flow.] Eviatar, A. , D. F. Strobel, B. C. Wolven, P. D. Feldman, M. A. McGrath, and D. J. Williams (2001), Astrophys. J, 555, 1013-1019. Feldman, P. D., M. A. McGrath, D. F. Strobel, H. W. Moos, K. D. Retherford, and B. C. Wolven (2000), Astrophys. J, 535, 1085-1090. Jia, X., R. J. Walker, M. G. Kivelson, K. K. Khurana, and J. A. Linker (2009), J. Geophys. Res., 114, A09209, doi:10.1029/2009JA014375. Khurana, K. K., R. T. Pappalardo, N. Murphy, and T. Denk (2007), Icarus, 191, 193-202, doi:10.1016/j.icarus.2007.04.022. Kopp, A. and W.-H. Ip (2002), J. Geophys. Res, 107(A12), 1490, doi:10.1029/2001JA005071.
Feldman Paul D.
Jia Xun
McGrath Melissa A.
Retherford Kurt D.
Saur Joachim
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