Aurora : Ενα υπεροχο Βιντεο

Aurora 2012 from Christian Mülhauser on Vimeo.

Explanation:

Have you ever seen an aurora?



Auroras are occurring again with increasing frequency.



With the Sun being

unusually dormant over the past four years, the amount of Sun-induced auroras has been unusually low.



More recently, however,

our Sun has become increasingly active and

exhibiting a greater abundance of

sunspots,

flares, and



coronal mass ejections.



Solar activity

like this

typically expels charged particles into the Solar System, some of which may trigger

Earthly auroras.



Two weeks ago, beyond trees and before stars, a solar storm precipitated the

above timelapse displays

of picturesque auroras above Ravnastua, Skoganvarre and

Lakselv,

Norway.



Curtains of auroral light, typically green,



flow,

shimmer and

dance as

energetic particles fall toward the Earth and

excite

air molecules high up in the Earth's atmosphere.



With solar maximum still in the future, there may be even better opportunities to see spectacular

auroras personally over the next few years.

from APOD