Auroras (well, not the ones from Punjab.)
I got an email about them. Actually, it was good to brush up about a thing from your school. The amazing photos got me yearning to visit those far off places of snow and coniferous trees. For more information and beautiful pictures visit Painted Sky: The Aurora, it's one of the pages of NASA's "Mission to Geospace" project.
"As solar storms disturb Earth's magnetic field, this field rearranges itself and converts some of its stored energy into the kinetic energy of fast-moving particles. These particles, partly from the Sun and partly from Earth, flow inwards towards Earth along the polar magnetic field lines. As they encounter the ionosphere, they are boosted in energy to 6,000 volts or more, and then collide with nitrogen and oxygen atoms to produce the auroral light."
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