In order to understand why their is a limited amount of colors that are produced by the phenomena aurora borealis, I will briefly describe how it occurs in the first place. When electrons coming from the sun via solar wind reach the earth, they strike atoms present surrounding the earth. The color that is produced as a result of this meeting depends on whether the electrons strike oxygen or nitrogen, and at what altitude this occurs. Oxygen produces green and red, and nitrogen produces blue and purple/violet.
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