The night I saw them, they were more vividly green than this, no blues, more emerald green I guess you'd call it. Someone left the bar, and came back in to tell us. Many of the people went out to watch, (and have a smoke). They looked like curtains and filled the whole sky.

IMO they are even more impressive in person, especially in the far north. December/January is really the peak for them, mostly because there are the longest periods of darkness. Apparently this phenomenom happens during the daytime too, but we can't see them. Of course cloudy skies cover them up also. Try to avoid the full moon as sometimes they seem more subtle than others.

A few years back my daughter managed to get a short video from southeastern Ontario, but they are low on the horizon from here.

Late Fall to early Spring. I got lucky with a great green show in May, and again in August, but this time just white. Was passenger in a car with a moon roof, so just laid my seat back and enjoyed the show. These visits were 10 years apart.

I hope you do. It is a very moving experience. Lucky enough to have seen them twice up in Yellowknife.