Editing Geophysics (section)

=== Magnetosphere ===
{{Main|Magnetosphere}}
[[Image:Structure of the magnetosphere mod.svg|upright=1.3|thumb|Schematic of Earth's magnetosphere. The [[solar wind]] flows from left to right. |alt=Diagram with colored surfaces and lines.]]
If a planet's [[magnetic field]] is strong enough, its interaction with the solar wind forms a magnetosphere. Early [[space probe]]s mapped out the gross dimensions of the Earth's magnetic field, which extends about 10 [[Earth radii]] towards the Sun. The solar wind, a stream of charged particles, streams out and around the terrestrial magnetic field, and continues behind the [[Magnetotail|magnetic tail]], hundreds of Earth radii downstream. Inside the magnetosphere, there are relatively dense regions of solar wind particles called the Van Allen radiation belts.<ref name=Kivelson/>