More about the Northern Lights

The strong green lights danced across the sky, rapidly changing in shape and colour. We were all totally engrossed in this magical experience and when the lights finally came to an abrupt end, we just stood there completely speechless...

Ms Turner, Abisko Sky Station

What are the northern lights?

The aurora borealis, or northern lights, appears when solar wind particles collide with air molecules in the earth’s atmosphere, transferring their energy into light.

Solar flares are explosions ejected by the Sun. These flares contain charged particles and if they head our way, carried on a solar wind, Earth’s magnetic fields divert them. Most disappear into space but if some enter our upper atmosphere, around the Polar Regions where those magnetic fields converge, then these charged particles react with the gases found there. These magnetic fields create auroral ovals around the top and bottom of our planet which move and distort as the Earth rotates and solar flare activity increases. You have to be within an auroral oval for a chance of seeing this particle/gas reaction hence why you need to travel north.

Why are displays different colours?

Displays can vary in intensity – from a glowing curtain of greenish yellow lights, dancing in the distance to a spectacular, multi-coloured fusion stretching across the sky. Most people lucky enough to see the aurora witness a display of neon green lights but if you are really lucky then that display might be yellow and red, or even multi-coloured. The differences depend on two main factors: what type of gas is reacting with the solar particles and at what altitude this activity is taking place. Most of it occurs 100-200km above the Earth – a level where 'excited' nitrogen atoms glow green and blue. And above 200km, oxygen atoms glow red when reacting with charged particles from the Sun.

Will I definitely see them?

Sightings of the northern lights can never be guaranteed, even when the conditions seem just right. Most people appreciate the northern lights are a natural phenomenon and we can't turn them on for you! But what we can do is get you to locations across the northern hemisphere where sightings are generally known to be better than anywhere else. And what’s more, those places have plenty of things to see and do during the day whilst you are not star gazing.

Patience is the key as well as a clear, cloudless winter’s night. It is important to be away from any sources of artificial light, such as street lighting. Displays can occur any time from around 5pm but most activity tends to be after 11pm - fortunately on many of our holidays you can opt to be woken during the night so you don’t miss a thing!

Sightings not only vary in intensity but in duration too, from just minutes to sometimes hours.

Viewing the northern lights

The darkest period which is between November and February offer longer evenings for gazing at the sky, while the strongest lights normally occur during October and March between 9pm and 1am. They are also seen as early as late August and as late as mid April ideal for combining with days spent exploring.

The phases of the moon don't affect aurora activity, but the moonlight can reduce the intensity of the displays. It is often mentioned that full moon should be avoided due to higher light concentration, however it is one of the most magical experiences to see the full moon together with the northern lights dancing across the sky. During a new moon the sky is slightly darker, but it is very much a matter of personal opinion, which of these sightings is the best.

We are currently in a period of 'Solar Max' when northern lights sightings are expected to be particularly intense and more frequent.