Astronomy Picture of the Day

Aurora in the Distance

Bild Note: 5.3 (4 Votes)

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#104697 by @ 20.11.2007 00:00 - nach oben -
Aurora in the Distance

Explanation: Some auroras can only be seen with a camera. They are called sub-visual and are too faint to be seen with the unaided eye. The reason is that the human eye only accumulates light for a fraction of a second at a time, while a camera shutter can be left open indefinitely. When photographing an already picturesque scene above Juneau, Alaska, USA, a camera caught green sub-visual aurora near the horizon. Auroras are sparked by energetic particles from the Sun impacting the magnetic environment around the Earth. Resultant energetic particles such as electrons and protons rain down near the Earth's poles and impact the air. The impacted air molecules temporarily lose electrons, and when oxygen molecules among them reacquire these electrons, they emit green light. Auroras are known to have many shapes and colors.

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#104731 by @ 21.11.2007 11:10 - nach oben -
nuttene, wieso nämets das nöd hochuflösender uf?
#104733 by @ 21.11.2007 12:38 - nach oben -
es gseht für mi sowieso sehr nöd noch foti us