HST/STIS Observations of Ganymede's Auroral Ovals at Eastern Elongation

Details HST/STIS Observations of Ganymede's Auroral Ovals at Eastern Elongation HST/STIS Observations of Ganymede's Auroral Ovals at Eastern Elongation

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23d..08s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM23D-08

Physics

[2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [6009] Planetary Sciences: Comets And Small Bodies / Aurorae, Airglow, And X-Ray Emission, [6222] Planetary Sciences: Solar System Objects / Ganymede

Scientific paper

We report on new Space Telescope Imaging Spectrograph (STIS) observations of Ganymede's auroral emissions obtained during two visits with the Hubble Space Telescope (HST) when Ganymede was located at eastern elongation. The observations of the first visit with five consecutive orbits were successfully obtained on November 19, 2010 and the second visit, also with five orbits, is scheduled during Jovian opposition in October/November 2011. We will present results of the full campaign in case of a successful execution of the second visit. Our observations cover more than half a cycle of system III longitudes of Ganymede's positions within Jupiter's magnetosphere for each visit. The observations clearly display northern and southern auroral ovals, which we analyze with respect to brightness and locations. Our goal is to set constraints on the interaction of Ganymede's mini-magnetosphere with Jupiter's magnetosphere, Ganymede's magnetic field and plasma environment, and, if possible, on Ganymede's neutral atmosphere.

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