The main factors that determine the color of aurora depend on the content of nitrogen and oxygen in the atmosphere; The contents of oxygen and nitrogen are often related to altitude.
So far, more than six aurora colors have been confirmed. They are red, yellow, pink, green, blue and purple.
pleasant surprise
When the solar wind reacts with oxygen, usually above 150 miles, red aurora will appear. However, red aurora is extremely rare. Therefore, people who can see the red aurora should have super good personality and luck.
Yellow and pink.
Yellow and pink aurora are also rare in nature. Moreover, only when the sun is active violently can people see these two colors. In fact, yellow and pink are a mixture of red and green or red and blue.
green
Green is the most important and common aurora color. The formation of green aurora is usually the product of solar wind colliding with oxygen in the atmosphere at a height of about 60 to 150 miles.
The aurora we saw in Iceland in June+10/October last year was also green.
Blue and purple
Blue and purple aurora are also rare. Moreover, there is only a chance to appear when the sun is active. The principle behind it is that when the solar wind reacts with nitrogen in the atmosphere at a height of 60 miles or less from the earth's surface, these two colors of aurora will be formed.
Having said that, I believe everyone has a more comprehensive understanding of Aurora. Aurora is a beautiful natural phenomenon and a precious wealth given to us by the earth. No matter which color it is, it has its unique charm and characteristics.
So, which one do you like best?
Remarks: The pictures in this article are all from the Internet.