The Best Northern Lights When Does It Happen Ideas. 5, astrophotographer gareth mon jones. Around every 11 years, the magnetic field of the sun flips so the north pole becomes the south and the south becomes the north.

They usually start to be seen around december and january, and peak around february and march. Web the northern lights are most active in march and september, according to the met office, during the equinox. The last peak was the weakest in a century.

