Magnetosphere

Definition

The magnetosphere is the region around a planet dominated by the planet's magnetic field. It protects the planet from solar wind and cosmic radiation.

5 Must Know Facts For Your Next Test

1. Earth's magnetosphere extends thousands of kilometers into space, forming a shield against solar wind.
2. The shape of Earth's magnetosphere is influenced by the solar wind, compressing it on the side facing the Sun and elongating it on the opposite side.
3. Magnetospheres are also observed around other planets in our solar system, such as Jupiter and Saturn.
4. Space weather events, like geomagnetic storms, can disrupt Earth's magnetosphere and affect communication systems.
5. The Van Allen radiation belts are part of Earth's magnetosphere, trapping charged particles from the Sun.

Review Questions

• How does Earth's magnetosphere protect us from space weather?
• What factors influence the shape of Earth's magnetosphere?
• Name two other planets in our solar system that have significant magnetospheres.

Related terms

Solar Wind:

A stream of charged particles released from the upper atmosphere of the Sun.

Geomagnetic Storm: A temporary disturbance of Earth's magnetosphere caused by solar wind shock waves.

Van Allen Radiation Belts:

Two layers of charged particles surrounding Earth trapped by its magnetic field.