It’s one in the morning on a ridgeline north of Fairbanks. Twenty below. The sky is black in every direction because there are no town lights to the north. A pale green smudge shows up just above the horizon, the kind of thing you’d write off as a cloud. Then it brightens. Then it starts to move.
That’s the aurora, and it’s why people plan trips a year out and stay up half the night in the cold.
If you’ve wondered what the northern lights actually are, how they form, and when you’re most likely to see them, this is the plain-language version. No jargon, no physics degree required.
What is the aurora borealis?
The aurora borealis, better known as the northern lights, is a natural light display that fills the night sky with green, pink, purple, and red. It isn’t fireworks, and it isn’t a trick of the atmosphere. It’s space weather: a visible connection between the sun, 93 million miles away, and the air right above your head.
The name is old. “Aurora” comes from the Roman goddess of dawn, and “borealis” is Latin for “of the north.” The lights are older still. Long before anyone could explain them, people across the north, including Alaska Native peoples of the Interior and Norse sailors an ocean away, built stories about spirits and ancestors into that glow.
How are the northern lights formed?
The sun is constantly throwing off a stream of charged particles called the solar wind. Earth’s magnetic field deflects most of it, working like an invisible shield. Near the poles, though, that field dips down and funnels some of those particles into our atmosphere.
Those particles slam into oxygen and nitrogen high overhead. Each collision releases a small burst of energy as light, the same basic idea as a neon sign glowing when electricity runs through the gas inside it. Multiply that by billions of collisions and you get the shifting curtains we call the aurora.
The color depends on which gas gets hit, and how high up it happens. Oxygen glows green and yellow roughly 60 to 190 miles up, and a rarer red above that. Nitrogen makes the blues and purples toward the bottom of the display. Different gas, different altitude, different night. That’s why no two displays look the same.
Northern lights facts: why Fairbanks works
Plenty of places see the aurora. Fairbanks sees it more often than almost anywhere else you can drive to.
- The city sits under the auroral oval, the ring around the North Pole where activity concentrates. Farther north isn’t automatically better. Being under the oval is what counts.
- Interior Alaska has a dry, continental climate, which means more clear nights than coastal aurora destinations get.
- Aurora season runs roughly late August through April, and the weeks around the September and March equinoxes have a long track record of strong activity.
- Even modest geomagnetic activity is usually enough to put something in the sky at this latitude.
Solar activity has run high through the current solar cycle, which peaked in 2024, and the seasons just after a peak often bring strong displays. Promising is not the same as certain, though. Nobody can promise you the lights.
Five ways to improve your odds
Stay up. Most activity lands between about 10 p.m. and 3 a.m., with the busiest stretch usually somewhere between midnight and 2 a.m.
Let your eyes adjust. Real darkness matters. Step away from artificial light and give yourself 15 to 20 minutes before you decide nothing’s happening. Checking your phone resets the clock. And don’t forget to keep your cube or igloo as dark as possible.
Wait it out. Displays often arrive in bursts of 10 to 30 minutes, with quiet gaps in between.
Face north. A clear view to the northern horizon gives you the best chance on a slow night.
Dress for 20 below. Layers, real boots, a hat, mittens, and something hot to drink. Cold is what sends most people inside right before the good part.
Watching from bed at Borealis Basecamp
This is why we built where we did. Borealis Basecamp sits on a dark-sky ridgeline north of Fairbanks, past the town lights, in the boreal forest with open sightlines to the north.
Transportation is included in every package, so from the second we pick you up, the driving is done. No rental car, no icy road at midnight, no hunting for an unmarked turnoff in the dark.
The part that surprises first-time guests is that you don’t have to stand outside for it. Our Igloos have clear domed ceilings, and the Cubes and Cube Suites have floor-to-ceiling windows, so the sky is right there from a warm bed.
And if the aurora turns up at 2 a.m. while you’re asleep, we’ll wake you. That’s the aurora wake-up call, and it’s the reason the whole setup works. You can go to bed at a reasonable hour and still not sleep through it.
We can’t promise the lights. Solar activity and cloud cover decide that, not us. What we can do is put you somewhere dark, warm, and pointed the right direction, then make sure you’re awake when something happens.
Ready to plan your nights under the sky? Have a look at our aurora packages.