Astronomy Picture of the Day



Aurora in the Distance

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Bild Note: 5.3 (4 Votes)

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zorg.ch
#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.




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