the earth's magnetic field originates at the outer core driven by heat escaping from the core.
where does the earth's magnetic field originate?
outer core driven by heat escaping from the core
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a star with a magnetic field will generate a magnetosphere that extends outward into the surrounding space. field lines from this field originate at one magnetic pole on the star then end at the other pole, forming a closed loop. the magnetosphere contains charged particles that are trapped from the stellar wind, which then move along these field lines. as the star rotates, the magnetosphere rotates with it, dragging along the charged particles.
stellar magnetic field