Aurora Borealis

This is one of the meteorological phenomenon I wish I could see in my life.

Most people knows about his beauty but not so many knows about his origin.

It is provoked by the sun wind, wich excites energetically the ions in the atmosphere most of them oxygen and nitrogen, and after they lose that extra energy emitting his spectroscopic light. Ions accumulates in the poles where the magnetic field of the earth is stronger , that is the cause why Auroras only happen in the North pole named Aurora Borealis or in the South pole named Aurora Australis.

Yellow to green tones comes from the emission of oxygen , blues come from the nitrogen and less common colors red and purple from the helium ions. 

The images need no words



2 Responses to “Aurora Borealis”

  1. Noemí Says:

    I found this interesting radio program about the sound of auroras

  2. nanonabla Says:

    Thanks a lot Noemi
    It’s very interesting to know the controversy about the existence of Auroras’ sound.
    It coud be a good future post.

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