To celebrate the 400th anniversary of Galileo's discovery of the Galilean moons, this session invites reviews and discussions on different aspects of magnetospheric interactions at Io, Europa, Ganymede and Callisto. Similarities and differences between each of the moons will be examined making use of scientific results covering the era of previous missions to the Jovian system including Pioneer 10/11, Voyager 1/2, Galileo, Ulysses, Cassini, and New Horizons. The interactions between the Galilean moons and the Jovian magnetosphere, and with Jupiter itself will be addressed with a view to providing input for the upcoming NASA Juno mission and the planning of synergistic measurements by the Jupiter Ganymede Orbiter and Jupiter Europa Orbiter in the proposed joint NASA-ESA EJSM-Laplace mission (and for the potential JAXA Jupiter Magnetospheric Orbiter). Comparative discussions of analogous interactions within the Saturn, Uranus, and Neptune systems are also welcome.