You might be surprised, but the night I went you couldn't actually see the aurora with your eye's - it was not bright enough!! The photo shown above was taken with a 20 second exposure. Aurora's are measured by a Kp index from 0 to 9. In Tasmania it needs to be around Kp 5 to be visible - the night I went it was around 3.5.I want to see the auroras one day. Very jealous!