The beautiful natural phenomenon of boreal auras is actually the result of collisions between the gaseous molecules in the Earth's atmosphere with electromagnetically charged particles coming from the Sun. The color variation of boreal auras is due to the type of gaseous molecules involved in this reaction. The observed color most often has a typical yellowish-green tone, being produced by oxygen molecules at a height of about 96 kilometers. Full red auras are rare and are produced by oxygen particles located at heights of over 320 kilometers. Nitrogen molecules produce blue or blue-purple blue boreal. Auros of yellow and purple were observed, but they are extremely rare. The connection between boreal auras and solar activity has been suspected since 1880. Due to the serious scientific research in this direction since 1950, it is known that electrons and protons in the sunlight are projected at very high speeds to the Earth through the so-called " solar winds. "
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Boreal Aurora occurs at heights between 80-640 kilometers in the terrestrial atmosphere. This type of aurora appears in the southern hemisphere, where it is naturally called "aurora aurora". Once this phenomenon occurs near the magnetic poles of the planet, the southern boundary at which the boreal aurora was observed was the city of New Orleans. The best places to observe are the north-west of Canada, Alaska, Norway, Iceland and northern Siberia. Aurora auras are not as visible as the Nordic, due to the fact that they are concentrated in Antarctica only. Researchers have also found that aurora activity is a cyclic one, appearing on average at about 11 years. The last Aurora boreal was observed in 2014. Obviously, their spectacular spectacle is best seen during Arctic nights.
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Of course, Gassendi was not the first person to name the phenomenon - his suggestion was only the first to remain stuck. The North Cree People called the Nordic Dancing of the Spirits, which is more than just a visual metaphor.
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A Norwegian account from the 13th century analyzes the origins of aurora borealis. Three possibilities are set in motion - first, that the oceans must be surrounded by fires of such enormity as to make the brightness of the sky. The next thing was that the glaciers became fluorescent after they absorbed the sunlight.
Image Credit NASA
The third, however, was a good estimate for 1230 AD. He claimed that the rays of the sun were so powerful that they could reach the world and light up the night. This theory was wrong, but the scientific knowledge of time was as good as it was to be.
source image: aurorahunter.com
Nordic light is caused by atomic excitement. Nitrogen and oxygen atoms become excited by solid winds over fifty kilometers in the atmosphere. This is the moment when the energy levels of atoms are high due to higher temperatures in the atmosphere.
Northern lights are also the result of ionization. An atom is transformed into an ion when charged particles (such as electrons) are added (or removed). What caused this was a mystery of centuries. The guilty comes from the sun itself.
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In the case of the Nordic Lights, the atoms in the two elements had an electron away from the solar wind. When they retrieve an electron and return to what is known as their basic state, they emit photons, which are the basic unit of light. They become visible to the naked eye because there are so many of them emitting nitrogen that returns to the basic state.
Atomic oxygen atoms mostly emit green light, although it can also be reddish brown depending on the amount of energy absorbed. Nitrogen, on the other hand, appears to be blue, if the atom recovers it from the lack of electron after ionization. Appears red if it has been in an excited state and returns to its basic state.
Image Credit Flickr NASA user
Image Credit Flickr NASA user
Image Credit Flickr NASA user
Few lucky people saw the borealis aurora in space. Whether or not you are interested in the science behind the phenomenon, North Lights remain something that once passed, is rarely forgotten
source : descopera.ro
source : wikipedia.org
source : aurora-service.eu
