This picture shows that there is a small region in which the particles are trapped into a plasmasphere.
Click on image for full size
T.S. Huang
Uranus' Plasmasphere
Uranus' plasmasphere is tiny. The rings of Uranus sweep away much of the particles in the area.
Particles enter the plasmasphere from the atmosphere as well as the magnetotail. Mathematical theory suggests that particles leave the plasmasphere by being swept directly into the atmosphere.
This picture shows that there is only a small region in which the particles are trapped. This region is the plasmasphere.
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