This image shows a particle bouncing back and forth from one pole of the Earth to the other.
Movie adapted from original clips provided courtesy of Professor Patricia Reiff, Rice University, Connections Program.
Some particles do move along the field lines of the Earth. The crowded magnetic field lines near the poles cause particles to "reflect" and move back the same direction the from which they came. They bounce back and forth from one pole of the Earth to the other.
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