magnetosphere

An asymmetric region surrounding a planet, star, or other body, in which the body’s magnetic field traps charged particles and dominates their behavior.

the magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet’s magnetic field than to the solar magnetic field.

The comet–shaped region around Earth or another planet in which charged particles are trapped or deflected. Shaped by the solar wind and the planet’s magnetic field.

the magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet’s magnetic field than to the solar magnetic field