Space Storms
http://www.pbs.org/wgbh/nova/sciencenow/0304/02.html
The current of solar wind's particle of plasma do interaction, and then accumulate them at plasma seat. They dive down to the inosphere very quickly, and collide with atmospheric particle, so they are excited state. When they return former condition, they radiate light.
They are Aurora.
I have never seen it, so I want to see it.
I think it's so beautiful.
vocablary
valley: noun an area of low land between hills or mountains.
exporse: to show something that is usually hidden.
except: to exclude
particle: a very small piece of something
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