Northern Lights?

A couple of days ago I made arrangements for my son and I to fly to Iceland on New Year's Day to spend a week tramping around the country.  I've never been there - and it will be his first trip out of the country - so we're both pretty jazzed.  One of my fondest memories is the two of us lying on the roof of our old house in Barre watching a fairly decent (by Vermont standards) display of the northern lights.  We figure with a week in Iceland - and remarkably long nights - we have a great chance to see an amazing display.  More important, I'm so looking forward to spending time with him.