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The Spring 2011 issue of The Earth Scientist is focused on modernizing seismology education. Thanks to IRIS, you can download this issue for free as a pdf. Print copies are available in our online store.
This image shows how electrons will circle around a magnetic field line one way and a proton will circle in the opposite direction.
Movie adapted from original clips provided courtesy of Professor Patricia Reiff, Rice University, Connections Program.

Basic Facts About Spiral Motion

Charged particles cannot easily move across magnetic field lines but are forced to spiral around them. Electrons encirle the field line in one direction, ions in the other direction.

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