Aurora borealis (northern lights) are a phenomena
caused by solar eruptions which generate solar winds.
Solar winds are then directed towards the earth which is protected
against magnetic storms by a magnetic belt.
The solar winds enter via the northern pole and the southern magnetic
pole.
Aurora borealis are created when there are too many particles.
The colors of aurora borealis correspond to the different gases in
the ionosphere. In aurora borealis, oxygen atoms give off red and
green light, depending on how high they are in the ionosphere. Nitrogen
molecules give off blue and violet light.
Just outside Longyearbyen in Adventdalen, an Auroral Station built
in 1978 works as an optical site for ground-based observations of
the dayside and nightside aurora. Data from this Auroral Station have
been used widely in publications throughout the last two decades of
auroral research.
Click
on the photos to enlarge - Photos taken in Longyearbyen
AURORA
BOREALIS 
