Ben - That's fantastic... love it! Yes when the aurora really gets going, it is very bright and the surroundings will light up as if there is a full moon out. In that case the colours in the pictures are representative of what you see with the naked eye. In the early stages when the aurora is very dim, the camera does a better job than the human eye. A long exposure will reveal colour that you just can't see otherwise, as you experienced with your own shot.
When the aurora is in full bloom, it is much more spectacular in person than what a photo can show. The exciting part is how fast the filaments can move, something the camera can never catch. And the dynamic range is also far more than the camera can handle. It is reminiscent of when I went to see a total solar eclipse, almost 20 years ago. I thought I'd be prepared for what I was going to see, since I had studied all kinds of pictures. But when I saw it in real-life, I was completely blown away. It is much, much more beautiful than any picture can ever show. The aurora is just like that... it's well worth the trip to see it!