Polar Plasma at Ganymede: Ionospheric outflow and discovery of the plasma sheet

Glyn Collinson1, William Paterson2, John Dorelli1, Alex Glocer1, Menelaos Sarantos2, Robert J Wilson3 and Christopher Bard2, (1)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (2)NASA Goddard Space Flight Center, Heliophysics Science Division, Greenbelt, MD, United States, (3)University of Colorado Boulder, Boulder, CO, United States