The auroras are centered around the Magnetic North and South Poles, not the physical poles. As you can see from this map, they move! During the late 1800's and early 1900's it was so far south, Auroras could be seen in the mid US....................
They move cuz the axis of the earth moves - we be on a wobbly planet.
This is so cool - I want to see this phenomenon in person before I die.