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The colours of the northern lights

The colours of the northern lights are determined by a number of factors:

The northern lights can be spectacular!

AuroraMAX – The Northern Lights, NWT

The bright pink fringe on the lower edge of the aurora occurs when electrons strike nitrogen in the atmosphere. (Credits: Canadian Space Agency, University of Calgary, Astronomy North)

The northern lights most often occur at altitudes of 100 to 300 km in the atmosphere, but can sometimes occur at altitudes of up to 600 km from the ground.

The following colours can be seen when the northern lights are in the sky.

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