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chapter3.pdf
Preview of http://www-gpsg.mit. edu/12.201_12.501/BO OK/chapter3.pdf
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Summary

The Earth's magnetic field has a long history of study, particularly for navigation, and its variations over time are crucial for understanding the Earth's core dynamics. The field's origin was unknown until the 20th century, when it was discovered that the outer core is composed of liquid metallic iron, which generates the magnetic field through rapid motion. The geodynamo theory explains the field's sustenance, despite ohmic dissipation. The magnetic field is similar to the gravity field in being a potential field, but differs in having positive and negative poles, and its strength and direction vary with time due to internal and external processes. Spherical harmonics are used to describe and analyze the magnetic field, which is dominated by an axial dipole. The field's variation over time is documented through paleomagnetism, where rocks retain a "memory" of the magnetic field.

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The Earth's magnetic field has a long history of study, particularly for navigation, and its variations over time are crucial for understanding the Earth's...

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