Charged Particles Spiral Along Earth's Magnetic Field Lines
Energetic electrons and protons, components of cosmic rays, from the Sun and deep outer space often follow the Earth's magnetic field lines rather than cross them. (Recall that the Earth's north magnetic pole is really a south pole in terms of a bar magnet. )
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"OpenStax College, College Physics. November 27, 2012."
http://cnx.org/content/m42375/latest/?collection=col11406/1.7
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