[RightWhale]

If you are farther north, you can see the bottom edge of the curtain. It ends many miles up above the earth. Sometimes up here it is like looking directly down the barrel of a huge rocket motor with the curtain all around and the center way above you. Or like you are a honeybee in the middle of a sunflower.

[sleavelessinseattle]

I never understood that the aurora was a vertical structure until I started reading Sky & Telescope...I've been a fan ever since the first issue I picked up...its the best 6 bucks you can spend IMHO. They had shots in there that were clear enough that you could tell the camera was aimed between two curtains that varied precisely with each other all the way up...just stunning detail!