I'd like to add that the colours are kinda like neon lights, different molecules will give different colours. Upper atmosphere isn't uniform across the globe, so northern areas tend to get different colours than southern. That said, energetic particles come into the atmosphere further, so when that happens in the north, you can get all the colours

I'm in Whitehorse and didn't know there were good lights out. Granted was cloudy last night as we got more snow again last night