
The northern lights ("Aurora Borealis") are a very
special phenomenon that is mostly restricted to a belt above Northern
Scandinavia but it can occasionally be seen as far south as Roma and Sicily.
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The northern lights are caused by the solar wind (charged
particles coming from the sun) hitting air molecules in the atmosphere
at heights between 100km and 400km. The colour depends on the energy of
the incoming particles and which molecules they hit.
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Unfortunately these pictures cannot catch the constant changing
of the northern lights on the sky. You have to imagine that it´s
always changing form, character and colour.
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