It is the outermost region of the Earth's atmosphere, also known as the exosphere. It extends above the ionosphere, starting at 500 km.

In this region the ionized particles are governed by the Earth's magnetic field and form a characteristic envelope modeled by the lines of force of the magnetic field and by the interaction with the Solar Wind.

On the side of the Sun the encounter between the particles of the solar wind and the outermost envelope of the magnetosphere forms a shock wave; on the opposite side the same particles of the solar wind drag the magnetosphere, making it take the form of a cometary tail.

The magnetosphere forms a true protective shield against the charged particles of the solar wind, preventing them from reaching the ground.

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Planetary magnetismMagnification (or increase)