RADIO · FIELD GUIDE
Radio Under the Aurora — Where the Northern Lights Are, and How to Hear Them
The aurora is over a real town somewhere right now. Which one — and what does it sound like?
There is a town somewhere north of you, right now, with the sky on fire — curtains of green light rippling overhead — and a radio station playing beneath it. This page is about finding that town and listening to it.
The aurora is a ring, not a spot
The first thing to unlearn is that the aurora happens "at the North Pole." It doesn't. It happens in a ring — the auroral oval — that circles the magnetic pole at roughly 65 to 70 degrees of geomagnetic latitude. The Sun's charged particles, funnelled down Earth's magnetic field lines, hit the upper atmosphere along that ring and light it up. Green and red come from oxygen; blue and violet from nitrogen. It's a glowing halo, permanently present, drawn around the top (and bottom) of the planet.
That's why the same handful of towns keep appearing on this page. Tromsø and Bodø in Arctic Norway, Inari in Finnish Lapland, Fairbanks in Alaska, Yellowknife, Whitehorse and Iqaluit across the Canadian north, Reykjavík in Iceland — these aren't random cold places. They sit directly under the oval. When people travel to "see the northern lights," these are the towns they fly to, because the ring hangs over them most clear, dark nights.
Why it moves — and why some nights are better
The oval breathes. When the Sun is quiet, it contracts tight over the pole and only the very-far-north towns have a chance. When a solar flare or a coronal mass ejection sends a gust of charged particles slamming into Earth's magnetic field, the oval flares brighter and pushes toward the equator — and suddenly the lights are visible from far lower latitudes. During the strongest geomagnetic storms, people have seen the aurora from places that normally never do.
So "where is the aurora tonight" is a genuinely live question with a genuinely changing answer — which is exactly what makes it worth putting on a map.
How we know where it's glowing
The forecast comes from OVATION, a model run by the US National Oceanic and Atmospheric Administration's Space Weather Prediction Center. OVATION takes the current state of the solar wind and Earth's magnetic field and produces a worldwide grid: for every point on Earth, the probability that a visible aurora is overhead in the next thirty minutes. NOAA refreshes it every few minutes and publishes it freely.
This page reads that grid directly over each aurora town and ranks the towns by their live probability. The percentage you see is the model's own number, shown exactly as it comes — no massaging. A high value means a real chance the lights are out over that town right now. A low value means they probably aren't. It is a forecast, not a live camera, and the sky always gets the final say — but it's a remarkably good answer to "which of these towns should I be listening to tonight."
If you want the raw space-weather picture behind the forecast, the Sky canvas's aurora view draws the whole glowing oval on the globe, and the Sun canvas's flares view shows what the Sun is doing to cause it in the first place. And if you'd rather watch the lights than read a probability, a live aurora cam points a camera straight at the northern sky.
Lightning: the sky's other show
The aurora is fireworks from above. Its opposite number is fireworks from below — a thunderstorm, with lightning cracking over a city and the sky doing something violent and beautiful for entirely different reasons. So this page carries a second, smaller list: the world's radio cities that have a real storm cell overhead right now, read live from current weather. When one appears, you can tune in and hear a place with lightning above it — the same instinct, pointed at the weather instead of the heavens.
The honest part
Aurora is fickle. Most nights the oval is quiet and the odds over any given town are low, and this page will tell you so plainly rather than dress a dull forecast up as a good one. But space weather turns fast: a gust of solar wind can light the sky within an hour. A quiet number now is not a quiet night — it's just an honest reading of this minute.
What doesn't change is that the ring is always there, always over some inhabited town, always with someone broadcasting beneath it. Point the dial north, and listen while the sky burns.
Frequently asked questions
What actually causes the aurora?
The Sun streams charged particles at Earth all the time — the solar wind — and flares and coronal mass ejections send stronger gusts. Earth's magnetic field funnels those particles down toward the poles, where they slam into oxygen and nitrogen high in the atmosphere and make them glow: green and red from oxygen, blue and purple from nitrogen. It's the same physics as a neon sign, lit by the Sun instead of an electrode.
Why do the same few towns keep showing up?
Because the aurora isn't centred on the geographic North Pole — it's a ring, the auroral oval, centred on the magnetic pole and typically sitting around 65–70° of geomagnetic latitude. Towns like Tromsø, Fairbanks, Yellowknife and Inari sit right under that ring, which is why they're the classic aurora destinations. On active nights the ring widens and pushes toward the equator, so cities much further south get a chance too; on quiet nights it contracts tight over the pole and only the far-north towns can see anything.
What is the probability number I'm seeing?
It's from NOAA's OVATION model — a physics-based forecast of the chance that a visible aurora is overhead at a given spot in the next half hour, published as a worldwide grid and refreshed every few minutes. We read the model's value directly over each town and show it as-is. A high number means a good chance the lights are out there now; a low number means they probably aren't. It's a forecast, not a camera — the sky is the final word.
Is this the same as the Kp index?
Related, but more useful. Kp is a single global number (0–9) for how disturbed Earth's magnetic field is — handy, but it tells you 'the field is stirred up somewhere,' not 'the aurora is over your town.' OVATION turns the space-weather picture into an actual map of where the glow is likely, which is the question a listener (or a chaser) really has. The Sky canvas shows both the full oval and the live Kp if you want the raw numbers.
Why are thunderstorms on an aurora page?
Because the idea is a dramatic sky over a place you can hear — and lightning is the aurora's opposite number: fireworks from below instead of above. When a real thunderstorm cell is sitting over one of the world's radio cities, you can tune in and hear the town with the storm overhead. It's the same 'listen to what the sky is doing' instinct, pointed at the troposphere instead of the magnetosphere.
The aurora forecast looks quiet. Is the page broken?
No — that's the honest state. The oval is always there, but most of the time it's contracted over the poles and the odds over inhabited towns are genuinely low. On those nights the page shows you the towns closest to the ring and their real, modest probabilities rather than inventing excitement. Aurora can flare up within an hour of a solar gust, so a quiet forecast now doesn't mean a quiet night — but we won't pretend otherwise.
Does the aurora happen in the south too?
Yes — the aurora australis is the mirror image, a ring around the south magnetic pole. There's just far less land under it, so fewer towns can broadcast from beneath it. Dunedin in New Zealand and the Patagonian towns of Argentina and Chile are about as far south as populated radio gets, and they catch the southern lights on strong nights. When the north is stormy, the south usually is too — the two ovals light up together.
HEAR IT LIVE
Everything in this guide is on the live radio globe — open it, tap a station, and hear the real thing.