How to see the northern (and southern) lights
What drives the aurora, how to read a Kp forecast, and how to be in the right place at the right time.
The aurora is sunlight's leftovers: charged particles from the Sun slamming into our atmosphere and making it glow. Catching it is part geography, part space weather, and part being ready when it fires.
Here's how to tilt the odds in your favour.
Understand the Kp index
Geomagnetic activity is rated on the Kp scale from 0 to 9. Higher means the auroral oval pushes further from the poles, so more people can see it. At high latitudes (northern Scandinavia, Alaska, Iceland, Tasmania) a modest Kp 3–4 is plenty; from mid-latitudes you usually need Kp 6+ and a bit of luck.
Stella pulls live space-weather data so you get an aurora watch for your own latitude instead of a generic global number.
Where and when to look
Find a spot with a clear, dark view toward the pole — north in the northern hemisphere, south in the southern. Get away from city light and any obstructions on that horizon.
Aurora is most active around local midnight, but a strong storm can light up the sky any time it's dark. The hours around a substorm onset can flare and fade within minutes.
Be ready to move
Big displays are often forecast only a day or two ahead, and clouds can ruin everything. The winners keep an eye on the forecast, have a dark north-facing site picked out, and can leave on short notice.
- Watch the Kp/space-weather forecast and set an alert
- Scout a dark site with an open poleward horizon in advance
- Check the cloud forecast — clear skies are non-negotiable
- A camera often catches colour and structure the eye can barely see
Stop guessing what tonight holds — Stella reads your sky and tells you when to go.
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