candidate: The Parker spiral shape of the solar wind changes the shape of the Sun 's magnetic field in the outer solar system : beyond about 10-20 astronomical units from the Sun , the magnetic field is nearly toroidal ( pointed around the equator of the Sun ) rather than poloidal ( pointed from the North to the South pole , as in a bar magnet ) or radial ( pointed outward or inward , as might be expected from the flow of the solar wind if the Sun were not rotating ) .