Aurora is a natural light display which usually seen in the Arctic and Antarctic regions. There are two types of Aurora: Aurora Australis and Aurora Borealis. This beautiful meteorological phenomena is caused by charges particles such as electrons and protons entering the atmosphere which causing ionization and excitation of atmospheric constituents. Aurora also caused by consequent optical emissions, also caused by emission production by protons.
This picture is one of my favorite nature wallpapers, nature wallpapers are the picture which taken from live condition of nature. You can create a nature wallpaper by taking a picture of anything in nature. I collect a lot of nature wallpaper such as mountains, rivers, waterfalls, flowers, forests, animals and other objects.
Here are several nature wallpapers that you can download for free: