You will probably want something wider to get most of the sky dome in one photo. Even a 16 mm lens only takes in about 1/3 of the sky horizon to horizon--just looked with my SAL1680Z. The wider the better.
A good set of lights will range all across the sky although I have seem them somewhat concentrated. Wider the better IMHO.
Taking several shots and stitching a pano is not an option because the aurora is always moving.
Have a great trip! I lust to take some NL photos..we have not seen them here for a few years EXCEPT there was a great display one night here a few weeks ago ... and I missed it! Don't forget your tripod.