I'm pretty sure those are airplanes - he's pretty close to a city which you can see in various views of the video. With a 10-20 sec exposure for the stars, a plane with landing lights will leave a nice streak.

check out his Aurora video - there are various light streaks in the capture as well
http://vimeo.com/21294655

and then there's his latest from the land of the midnight sun, a place where "sunset light" can last for many hours
http://vimeo.com/24456787

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