| 1. | See Dynamo theory to see how the Earth's magnetic field is created and changes.
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| 2. | This is called the frozen flux approximation which is widely used in dynamo theory.
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| 3. | The dynamo theory holds that planetary magnetism arises as inner flows of metals produce electromagnetic fields.
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| 4. | The Dynamo theory proposes that these movements produce electric currents that, in turn, produce the magnetic field.
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| 5. | He was important to dynamo theory, hence his most important work concerned the source of the Earth's magnetic field.
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| 6. | :The key is dynamo theory.
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| 7. | Dynamo theory suggests that convection in the outer core, combined with the Coriolis effect, gives rise to Earth's magnetic field.
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| 8. | Humphreys claims that the measured values where within the bounds of his predictions, while dynamo theories had been incorrect about Uranus'field.
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| 9. | This means that dynamo theory was originally used to explain the Sun's magnetic field in its relationship with that of the Earth.
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| 10. | In physics, the "'dynamo theory "'proposes a mechanism by which a celestial body such as Earth or a star generates a magnetic field.
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