At this time of year, At this time of day, In this part of the country, LOCALISED ENTIRELY WITHIN YOUR KITCHEN?!
In all seriousness though, this background is really pretty, it'd fit beautifully with like a snowy moutain or an ice canyon level. If you really want to up your game, maybe try adding multiple colors to the sky, to make it more like a real aurora. (I'd recommend some shade of magenta or a more distinct green)