images

Aurora borealis in Alaska 02/2001

by

D.Anderson/Novapix

Reference

t-met01-11002

Date

2007-04-04

This image is taken near Tok, Alaska in the east-central area. This type of green aurora is the most common. It is caused by the excitation of oxygen ataoms at 100 to 150 km altitude. Feb 20 2001.