Photographing auroras is all about finding the combination of aperture, ISO and exposure time which works for you. All three are dependable on each other and in the end it is up to you to experiment and come up with the best result. There is no fixed recipe.
Short exposure times let you ‘freeze’ details of the aurora, long exposures blur out the details. The wider/faster your lense is (a small f-number) the more light gets into the camera. This will allow for shorter exposure times. High ISO settings cause often noise in the photo but allow also for shorter exposure times.
Lets say the following settings result in a good image: aperture f4, ISO 800 and exposure time 5 sec. Now you want to freeze more of the aurora details, so you need to shorten the exposure time to – lets say – 2,5s. Your photos will be much darker now but there are two solutions to fix that. ISO to 1600 or f to 2,8.
Best thing to do is to go out in darkness and play with your camera settings.

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