Earth
The Earth's steady magnetic field is produced by many sources, both above and below the planet's surface. From the core outward, these include the geomagnetic dynamo, crustal magnetization, ionospheric dynamo, ring current, magnetopause current, tail current, field-aligned currents, and auroral electrojets. The geomagnetic dynamo is the most important source because,
posted by TiredKnife @ 9:00 PM
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