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batterypark wrote:
thank you for the beautiful photos - did you have to do any research before going? i’d love to try to get a shot of an aurora one day!
I did quite a bit before leaving. The hardest part of it is trying to align a day with high Kp (a measure of geomagnetic activity), with a relatively new moon, and a cloudless night. To some extent you just have to get lucky having those three things align while you are visiting. Beyond even those three factors, there doesn't seem to be a great way to predict at which time the aurora is really going to become active in the sky. The first night we were there, the Kp was high and we could only see a faint band and we were exhausted from having spent 15 hours traveling and landing at 1am so we went to bed around 3 after giving up. At 4:30 am it became very active while we were asleep! We resolved to just stay awake the second night until we could really appreciate it and got lucky with it becoming active between 11p and 1a. The rest of the trip was cloudy so nice dice for further photos.
As far as location scouting, my buddy lives in Fairbanks and gave us tips, which was helpful because online people recommend driving all the way to chena hotsprings (1hr away, in the dark, and iced over roads with a large population of moose). Fortunately he recommended a local mountain with a slightly better road that was mostly cleared.
As far as research taking the shot itself, you need a wide aperture lens (f/2.8 or better) because you really don't want to be extending exposures past 5-10 seconds. The aurora moves fairly briskly for an astronomical event and to get the stacks of light instead of a blur you need a shorter exposure time. I had initially started capturing 20s exposures and quickly lowered these to 10s. It is pretty darn bright so you'll have more light than you would expect. I honestly thought it was going to be fairly dim like the milky way where your eyes have to adjust but the aurora is as bright as a dim flashlight when its active!
Its awesome and worth the effort to see such an incredible natural phenomenon!
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