Aurora borealis green sky
1344×768 · AVIF · CC BY 4.0
Aurora borealis in a green sky: a rare natural spectacle
About this subject
The aurora borealis, also known as the northern lights, is a natural phenomenon caused by the interaction between charged particles from the solar wind and the Earth's atmosphere. It is more common in polar regions, where the atmosphere is thinner and allows these particles to be detected. The green color is caused by the excitation of oxygen atoms at high altitude, which emit green light when they return to their normal state. The frequency and intensity of the aurora borealis vary according to solar activity and the time of year.
Frequently Asked Questions
What causes the aurora borealis?
The interaction between charged particles from the solar wind and the Earth's atmosphere.
Where is it more common to see the aurora borealis?
In polar regions, such as Norway, Sweden and Canada.
Why is the aurora borealis more intense at some time of the year?
Due to solar activity and the time of year, which affect the frequency and intensity of the phenomenon.
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