Photographing the Northern Lights: When to Look

Photographing the aurora is unusual in that the gear questions are the easy bit. Most modern cameras can capture it. The hard part is being in the right place on the right night, with the sky cooperating, awake, and with the camera pointing at the correct part of the horizon. That is a planning problem.

What you actually need to see them

Four conditions, all four required, no shortcuts.

• Geographic latitude. Auroras happen in oval rings around the magnetic poles. Around 65° to 70° latitude is the typical visible band on a quiet night. On strong storms it pushes south, sometimes far south.
• Solar activity. The sun needs to have flung enough charged particles your way to trigger an event. The official tracker is NOAA's Space Weather Prediction Center. Watch the Kp index — Kp 3-4 is enough at high latitudes, Kp 6+ becomes visible at mid latitudes.
• Astronomical darkness. If the sky is not properly dark, you will not see anything. This is the part most beginners ignore. In summer above 60° latitude there is no astronomical darkness at all for weeks. You cannot see auroras in Reykjavik in June even when they happen, because there is too much sky glow. Season matters as much as activity.
• Clear sky. Auroras are above the clouds. If there is overcast, you are out of the show. Aurora chasers stalk clear-sky pockets the way landscape photographers stalk cloudy ones.

The aurora season

Roughly mid-September to mid-April for high-latitude sites. The peak activity windows tend to cluster around the equinoxes (March and September) thanks to the Russell-McPherron effect — Wikipedia's aurora page explains the geometry. Practically, that means September-October and February-March give you the best balance of long-enough nights and elevated activity.

The local timing

The most common visible time is roughly 22:00 to 02:00 local. The geometric reason is that this is when your location sits closest to midnight relative to the magnetic pole and you are facing the auroral oval. Strong storms break this rule, but for trip planning, assume you are awake from late evening to a couple of hours after midnight. Sunhour showing you the end of astronomical twilight tells you exactly when the sky becomes dark enough for the aurora to actually pop visually.

Which direction to face

Almost always north (in the northern hemisphere). The auroral oval sits over the magnetic pole, and the visible bands form between you and the pole. If you are at high enough latitude that the oval is overhead, then everywhere. But the default planning assumption is: face north, with a wide foreground, somewhere with an unobstructed horizon.

Camera settings, briefly

Manual focus at infinity (test this in daylight, mark the lens). Aperture wide — f/2.8 or wider if you have it. ISO between 800 and 6400 depending on aurora brightness and camera. Shutter speed between 2 and 15 seconds. Faster shutter for fast-moving auroras (otherwise the structure smears into a green wash), longer for faint diffuse ones. Daylight white balance.

The trap

Long shutter speeds will give you bright, dramatic-looking auroras even when there is barely anything to see with the naked eye. This is misleading. If you cannot see structure with your eyes, do not waste an hour trying to make the camera do it for you — wait for an actual show.

The patience tax

The aurora does not care about your schedule. The pattern in Norway, Iceland, northern Finland, Alaska, northern Canada is to book a week and accept that maybe two or three nights deliver. The rest is cloud, low activity, or both. Plan downtime activities for the dud nights — there will be dud nights.

A planning template

1. Pick a destination at 64° to 70° latitude.
2. Pick a date between mid-September and mid-April. Equinoxes preferred.
3. Check that the moon is in a thin phase to avoid sky glow.
4. Use sunhour to confirm that astronomical twilight ends early enough to be useful.
5. On each night, watch NOAA's forecast and a local cloud-cover forecast.

Get those right and the photograph is the easy part.