Magnetopause

A magnetopause flows along the boundary between a magnetic field, (see: magnetosphere) and surrounding plasma. It behaves roughly like a droplet of liquid exposed to supersonic flow. The magnetopause will ripple, flap, and sometimes droplets will break off.

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In terms of planetary science, the magnetopause is the location where the outward magnetic pressure of the Earth's magnetic field is counterbalanced by the solar wind, a plasma. Most of the solar particles are deflected to either side of the magnetopause, much like water is deflected before the bow of a ship. However, some particles become trapped within the Earth's magnetic field and form radiation belts.

See also

• Heliopause
• Magnetosphere
• Shock wave
• Solar system
• Van Allen radiation belt
• For applications to spacecraft propulsion, see magnetic sail.