The Earth’s Magnetic Field

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Presentation transcript:

The Earth’s Magnetic Field

Earth is like a bar magnet

The Earth’s Magnetic Field protects us from Solar Wind A stream of electrically charged particles that could destroy life on earth

Interaction between solar wind and earth’s atmosphere can be seen near the north & south pole in the form of Aurorae

What causes our Magnetic Field? The Dynamo Theory: Rotation of the earth causes liquid rock in outer core to spin Moving electrons from the iron & nickel creates an electric current Electric currents produce magnet fields (Faraday’s Law)

To make an electromagnet: you only need flowing electrons that surround an iron core

The magnetic field changes through time, due to changes in the flow of molten currents

How do we know it changes? Below a certain temperature, rocks will “record” the direction of the magnetic field