The magnetopause is the boundary that separates a planet's magnetosphere from the solar wind, which is a stream of charged particles (mostly electrons and protons) emitted by the sun. For Earth, the magnetopause marks the outer edge of the magnetosphere, where the pressure of the solar wind is balanced by the magnetic pressure of the Earth's magnetic field. In simpler terms, the magnetopause is the region where the influence of the Earth's magnetic field ends and the solar wind begins.
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