When is the best time to see the Northern Lights?

The Northern Lights are best seen on dark, clear nights in autumn and spring. The best time is usually between 9 p.m. and 2 a.m. In northern Finland, a Kp index of 3–4 is sufficient, while in the south, a Kp index of 5–6 or higher is required.

What do the values on the map mean?

The Kp index shown on the map indicates geomagnetic activity. The higher the value, the more likely it is that the Northern Lights will be visible. For example:

• Kp 0–2: No probability
• Kp 3–4: Northern Finland
• Kp 5+: Southern Finland possible

How does cloud cover affect visibility?

Clouds prevent the northern lights from being seen. Check the cloud cover map before you leave – a clear sky is essential.

Do I need a dark place?

Yes. Light pollution in cities reduces visibility. Move away from street lights and choose an open place.

Can the Northern Lights be seen in southern Finland?

Yes, but less frequently. A high Kp index (≥ 5–6) and clear skies are required.

How do I know when the Northern Lights will appear?

Use real-time maps like RepoTracker.fi for forecasts. You can also follow information from NOAA and the Finnish Meteorological Institute.

What are solar wind and IMF Bz?

Solar wind is a stream of particles from the Sun that brings energy to the Earth's magnetic field. The IMF Bz value indicates the direction of the magnetic field – a negative Bz increases the likelihood of auroras.

What should you keep in mind when going hunting for the Northern Lights?

Dress warmly – one thick coat is not the best option; it is better to wear several thin layers under your coat. Layering keeps you warmer and gives you flexibility. Finally, add a proper winter coat.

Wear warm shoes and gloves, and bring extra clothes if you plan to be outside for a long time.

If you are moving with a rental car, stay on plowed public roads. Do not drive on poorly maintained or unplowed forest roads, so you don't get stuck in the snow. It can take a long time for help to arrive in winter