Different
types of aurora
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Finally, some of the excited particles in the radiation
belts can plunge into the upper atmosphere, where they collide with oxygen
and nitrogen. These collisions-which usually occur between 40 and 200 miles
above ground-cause the oxygen and nitrogen to become electrically excited
and to emit light (fluorescent lights and televisions work in much the
same way). The result is a dazzling dance of green, blue, white, and red
light in the night sky, also known as aurora borealis and aurora australis
(northern and southern lights). Auroras can appear as colorful, wispy curtains
of light ruffling in the night sky, or sometimes as diffuse, flickering
bands. Either way, they tell us that something electric is happening in
the space around Earth.
Different
types of aurora