The Cassini spacecraft had a slight positive charge and became magnetically grounded to the moon even at a distance over 1,200 miles. The magnetic field aligned electron particle beam from Hyperion's surface briefly struck the Cassini spacecraft with a 200 volt shock, equivalent to the negative surface charge on the moon's surface. The dark side of earth's moon has a surface charge of negative 20 volts, that increases in the magnetosphere up to negative 200 volts.
A laboratory electron particle beam being deflected by a magnetic field from a magnet.
Bending electron beams with magnets
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