Pulchritude: Aurora Borealis

Copyright Crey – CC BY 2.0 Aurora Borealis March 17, 2015

Aurora Borealis, or Northern Lights, is a rare geomagnetic phenomenon that occurs in the upper latitudes of the Northern Hemisphere.  The Aurora Borealis is characterized by green and yellow colors, with blue and red occurring on a less frequent basis.  An aurora occurs when charged particles from outside the Earth’s atmosphere enter and cause ionization and excited atmospheric constituents.  This results in an optical display of emissions known as ‘lights.’


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