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Home > All Images > 1999 > July > 28 Jul 1999

Images Dated 28th July 1999

Available as Framed Prints, Photos, Wall Art and Gift Items

Choose from 5 pictures in our Images Dated 28th July 1999 collection for your Wall Art or Photo Gift. Popular choices include Framed Prints, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.


Aurora Borealis display over Manitoba, Canada Featured 28 Jul 1999 Print

Aurora Borealis display over Manitoba, Canada

Aurora Borealis. Aurora Borealis or Northern Lights display over trees and snow. The setting Moon is seen at lower left. Aurorae are caused by the interaction between energetic charged particles from the Sun and gas molecules in the upper atmosphere about 100 kilometres up. A stream of charged particles, called the solar wind, flows out into space continuously from the Sun at speeds of 400-500 kilometres per second. On reaching Earth, the charged particles are drawn by Earth's magnetic field to the poles, where they collide with gas molecules in the upper atmosphere, causing them to emit light. Photographed from Churchill, Manitoba, Canada

© CHRIS MADELEY/SCIENCE PHOTO LIBRARY