Earth’s magnetic field

Definition

Earth's magnetic field is a geomagnetic phenomenon generated by the movement of molten iron alloys in its outer core. It extends from the planet's interior out into space, where it interacts with solar wind and cosmic radiation.

5 Must Know Facts For Your Next Test

1. The Earth's magnetic field is primarily dipolar, having a north and south magnetic pole.
2. It protects the Earth from solar wind and cosmic radiation by deflecting charged particles.
3. The magnetic field's strength varies across the planet and has been observed to weaken over time.
4. Geomagnetic reversals have occurred throughout Earth's history, where the magnetic poles switch places.
5. The magnetosphere is the region around Earth influenced by its magnetic field.

Review Questions

• What generates Earth's magnetic field?
• How does Earth's magnetic field protect life on our planet?
• What are geomagnetic reversals?

Related terms

Magnetosphere: The region of space surrounding Earth that is dominated by Earth's magnetic field.

Solar Wind: A stream of charged particles released from the upper atmosphere of the Sun, interacting with Earth's magnetosphere.

Geomagnetic Reversal: A change in a planet's magnetic field such that the positions of the north and south magnetic poles are interchanged.