Sunday, September 25, 2011

APOD 1.4 September's Aurora

September's Aurora

This picture is puzzling to me. The caption clearly states that the aurora was seen form outer space as well as here on Earth, yet the stars appear to be in between us and the lights? How could that happen? The colors of the gases and the shapes do however invoke a scientific curiosity within me. Based on the linked view of the lights from space the color is still there, even when viewed from a place not affected by our atmosphere. This being the case the magnetized gases have to have the color before crossing through our atmosphere, and if this is true then what would have caused it? Magnetized gases from the sun which would typically appear yellow or brownish in their normal state seem shades of green and red when they cross with Earth's magnetic field. Assuming the composition of the gases and their shape are the same, then what causes the viewable difference?

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