it isn't possible to have the magnetic field in the FE model at both the North and South pole, because the "magnet" has to be perpindicular to the surface of the earth (if you consider it flat) or normal to the surface of the earth (if you consider it round)
in FE this would mean that the further south you go (even past the equator) the weaker the magnetic field would get, however, for the southern lights to occur, the magnetic field needs to be as strong at the "ice wall" as it is at the north pole.
even if you had a radial "magnet" such that you had a north pole at the centre and a south pole all around the outside, the nature of the magnet would make the centre much stronger magnetically than the outside, and you still wouldn't get the southern lights