+18 What Makes The Northern Lights Green Ideas. This plasma travels from the sun to space through the solar wind. When the oxygen is “excited” at these altitudes it causes the aurora to appear in shades of green.
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Green is the most common colour seen from the ground and is produced when charged particles collide with oxygen molecules at altitudes of 100 to 300 km. Asymmetric auroral intensities in the earth’s northern and southern hemispheres. “we sometimes see a wonderful scarlet red colour, and this is caused by very high altitude oxygen interacting with solar particles,” adds astronomer tom.
