Where can I see the aurora in northern Europe? What season?

Aurora phenomenon exists in northern Europe all year round, but sometimes the light is not bright and can't be seen by the naked eye. The only area visible to the naked eye is the polar region in the center of the North Pole. In Scandinavia, Norway, northern Sweden and Greenland are suitable places to watch the aurora. From September, when the sunshine time is relatively short every year, to April of the following year, the aurora phenomenon occurs about every three days.

I hope it will help you to see it on the Nordic Tourism Bureau official website.