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What factor determines the COLOR of Aurora Borealis?

Most pictures I've viewed of the Northern Lights are green but once in a while there are some that have orange or red.

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­As the electrons enter the earth's upper atmosphere, they will encounter atoms of oxygen and nitrogen at altitudes from 20 to 200 miles above the earth's surface.

The color of the aurora depends on which atom is struck, and the altitude of the meeting.

•Green - oxygen, up to 150 miles in altitude
•Red - oxygen, above 150 miles in altitude
•Blue - nitrogen, up to 60 miles in altitude
•Purple/violet - nitrogen, above 60 miles in altitude

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