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Northern Light appearing at 21:30
Iceland
A thin band of the Northern Lights appears just after sun down.

Typically the aurora appears either as a diffuse glow or as "curtains" that approximately extend in the east-west direction. At some times, they form "quiet arcs"; at others ("active aurora"), they evolve and change constantly. Each curtain consists of many parallel rays, each lined up with the local direction of the magnetic field lines, suggesting that aurora is shaped by Earth's magnetic field. Indeed, satellites show electrons to be guided by magnetic field lines, spiraling around them while moving towards Earth.

Read more about the Northern Lights here.
Copyright: Tom Mills
Type: Spherical
Resolution: 8366x4183
Chargée: 16/09/2008
Mis à jour: 08/10/2014
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Tags: science
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