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Imagine tiny bar magnets travelling through space that are in the correct north to south orientation so they are attracted to Earth's magnetic field.

If the interior is electrically conducting, a thick layer of convecting material will generate a dipole magnetic field similar to that of a bar magnet.

To magnetize an iron nail, one simply has to stroke its surface several times with a bar magnet.

But unlike Earth’s magnetic field or that of a bar magnet, the sun’s magnetism is patchy and highly fluid, even during its dipole stage.

Because Earth’s magnetic field is dipolar like a bar magnet and aligned roughly perpendicular to our world’s rotation, geomagnetic field lines extend most prominently from the vicinity of our planet’s North and South poles.