Latest
Best time to see the northern lights in Tromsø
When to visit Tromsø for the aurora, which hours of the night to watch, how the moon and weather change things, and how to choose a spot.
Blog
Notes on the northern lights
Where and when to look, how to read a cloud forecast, and news from the Aurora Atlas app. Follow along in your feed reader with the RSS feed.
More posts
Clouds
Clouds are the real aurora forecast
Why cloud cover decides most aurora nights, why one cloud percentage misleads, and how to use hourly forecasts and a car to find a clear sky.
Aurora Atlas
From a local Tromsø app to a global aurora app
How Aurora Tromsø, a small app for one Arctic city, grew into Aurora Atlas: what we built, what was hard, and why we started local.
Kp index
What the Kp index really tells you (and what it doesn't)
Kp is a global, three-hour measure of geomagnetic activity. Here is what it means for your aurora night, why location matters, and what it leaves out.