THIS IS A FIRE RAINBOW - THE RAREST OF ALL NATURALLY OCCURRING ATMOSPHERIC PHENOMENA. THE ASSOCIATED PRESS PICTURE WAS CAPTURED ON THE iDAHO/WASHINGTON BORDER. THE EVENT LASTED ABOUT 1 HOUR CLOUDS HAVE TO BE CIRRUS, AT LEAST 20K FEET IN THE AIR, WITH JUST THE RIGHT AMOUNT OF ICE CRYSTALS AND THE SUN HAS TO HIT THE CLOUDS AT PRECISELY 58 DEGREES ...and snopes weighs in on the pic: http://www.snopes.com/photos/natural/firerainbow.asp
This blog includes pics of the Northern Lights over Yellow Knife, Canada: http://www.myinterestingfiles.com/2008/07/northern-lights-fire-rainbow.html