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Unformatted text preview: Note: • magnetic poles are NOT aligned with the rotation axis • magnetic poles move o N pole moved about 800 km toward the rotation axis in last 150 years • magnetic poles flip o sometimes S magnetic pole is on "top" o poles typically stay for about 10,000 - 100,000 years o evidence from alignment in rocks OPTIONAL MATERIAL: magnetic field traps charged particles from the Sun Figure 5.19 in the book also shows the Van Allen radiation belts. [Link to Figure 5.19] (Fig. 4.20 in 2nd ed.) Aurora (northern lights) come from charge particles interactng with atmosphere...
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- Spring '10
- Astronomy, Magnetic Field