Wallpaper | Nor... | 1024x768 Purple Northern Lights

: Unlike the common green aurora caused by oxygen, purple and blue hues are produced by ionized nitrogen .

: Because nitrogen is harder to "excite" than oxygen, purple lights generally only appear during strong geomagnetic storms when solar particles have enough energy to penetrate deeper into the atmosphere. 1024x768 purple northern lights wallpaper | Nor...

The "magic" of a purple aurora is actually a chemical reaction in our atmosphere: : Unlike the common green aurora caused by