Wow, didn't expect so many answers. Thank you everyone, especially those sharing their experiences! That last link is very helpful, scientific answers are always great.
Of course a field trip would be a good idea, the thing is that it's kind of impossible for me to go that far north right now. Also, snow means winter, and right now it's summer
a little deviation from the subject, but thank you to all for this topic, given me some ideas for using auroras as light-sources. granted maybe not as intense or strong light-source realistically, but hey, fantasy art has ways xD
anyway! a post to thank all, as opposed to thanking all individually
time to draw some goodies