À Propos des aurores boréales

About auroras borealis

Auroras borealis are a chemical phenomenon of the most complex, a brilliant demonstration of trainées of light which are visible at the level of poles. They are lights of different but regular forms. One can appoint the observed stylistic devices, they take the aspect of phosphorescent light of varied colours, of whom usually the green. Auroras borealis show themselves in the North Pole and auroras australis are in the south pole. In 1621, certain Gassendi was the first to describe scientifically an aurora borealis and since 1970, by way of the scientists, it was established that auroras borealis were in connection with the sunspots of the sun. The popular faith that they are reflections of the sun on the ica floes of the North Pole would be the cause which is still of the most wide-spread. In spite of our knowledge on dawns, they keep some more of mystery, of which with the auroral sounds that some heard during one dawns.

Forming of auroras borealis The sun is a gigantic gas ball. During eruptions solar energy important, magnetic fields and ground atmosphere upsets, shock between particles provokes the fire of the sky at the level of magnetic poles. Indeed, gases and rays of light, not to say the electric sources from the sun, which are transported by solar winds from the sun, put 20 at 40 o'clock to arrive towards the earth. Moreover, there are 2 types of solar wind, the fast and little dense wind with a speed of 700km / dry and the 300km / dry slow and dense wind. Their speed increases during eruption solar energy.

In the door of the earth, fields magnetic ground draw up youself as a wall in front of them but electrons, protons and ionized particles coming from the sun clear themselves a passage then contact the atoms of nitrogen and the atoms of oxygen which get excited. Colored brilliances appear then these rays of light divide up around the earth, but they are for the poles that they are the most visible. Auroras borealis and big eruptions solar energy have cycles of 10 or 11 years but are visible and display locally every year.

Place of auroral demonstration In the magnetic poles of the North and the South, in the North Pole, in the regions of Iceland, Greenland, Boreal Siberia, Alaska and big regions Scandinavians then the northerly regions of Canada, of which Quebec. Auroras borealis show themselves also on the other planets, such as Jupiter and Uranus, because they possess one fields magnetic and an atmosphere.

Characteristic of auroras borealis
Auroras borealis can persist several hours by evolving constantly and by going out bit by bit. Some are going to last several days. Observation makes generally at night, frequently around midnight, and at about the 22 o'clock at 3 o'clock in the morning. If a dawn is observed early in the evening, it is very possible that the other one will follow some hours later. The intensity of the phenomenon is very variable, going of simple one hardly perceptible bow in the bare eye in the magnetic thunderstorm which is a phenomenon with maximal observation. The aurora borealis shows more often itself among 100 and 150 km in height and it appears in the north direction. Cloudy times and full moon will be obstacles in the observation of the phenomenon. Colours and forms particles solar energy striking molecular forms create brilliant waves. The atoms of oxygen shine with yellow - green colour which is of the most sensational in 100 km in height and of dark red which is rarer in more than 300 km. The colours of the light correspond to certain gases in contact because certain gases correspond to a single colour and of the other one emit some of it but the combination of colours remains unique for a definite gas, in more than this gas can have a neutral or charged state. The atoms of nitrogen shine with colour blue - purple in 100 km in height and of pale red unless 100 km.

Forms are observed and one can appoin) them. Bows and draperies are described as forms of spiral and wave in a regular way, it extend throughout the horizon as a simple curve. The length a bow can affect 1000 km or more while its thickness is lower than 100 km. The band presents an irregular shape presenting rolling-ups and folds. The line corresponds to pillars and to vertical lines. The present crown of summits or the very net muddled base. Crowns open in everybody directions. The spot has the shape of a small spot of light looking like a cloud. The veil covers a vast region of uniform luminosity which covers a big part of the sky. All the forms can be perceived differently if observers is under a magnetic line of fields. Colours and forms of the aurora borealis change from one second to the other one during the presences.

Infinity of time I end these comments on auroras borealis sharing you a poem on auroras borealis writes by Frédéric M. who was certainly inspired during night Scandinavian but reflects a fascinating state of mind.

Such a short and majestic cycle of life sublime Birth emanating only of one gods Your distant image, our radiant faces agree marvelously in a luxurious ballet

Aurore transported by sinuous winds Your graceful spectacle illuminates the short-lived and nevertheless eternal heavens in our eyes Such a short and majestic cycle of life

Theater for giant of whom the man is foreign immense majesty of your rippling folds We made to lie how powerless To remember fugitive whom one can not prolong

Brilliant lights there is only a dream Your appearance at which cruel time eats away

These comments on auroras borealis result from numerous texts on the subject registered in the world of the internet and www.banditdenuit.com aims to give of the general information about the phenomenon.