SciShow tackles a Quick Question with a longish answer: What causes auroras? TL;DR: It's a breathtaking display of particle physics in action.
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Sources:
http://science.howstuffworks.com/nature/climate-weather/atmospheric/aurora2.htm
http://curious.astro.cornell.edu/question.php?number=780
http://pwg.gsfc.nasa.gov/polar/telecons/archive/PR_E-PO/Aurora_flyer/aurora-flyer_p2.doc.pdf
http://imagine.gsfc.nasa.gov/docs/teachers/lessons/xray_spectra/background-atoms.html
http://science.nasa.gov/science-news/science-at-nasa/2003/29dec_magneticfield/
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magearth.html
http://www.wikipremed.com/mcat_course.php?code=0104030101000000
http://nmp.jpl.nasa.gov/st5/SCIENCE/magnetosphere2.html
http://sciencefocus.com/qa/what%E2%80%99s-furthest-south-northern-lights-have-been-seen
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