Polar aurora

Polar aurora

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A polar aurora It is a spectacular phenomenon of the High Atmosphere caused by the impact of charged atomic particles, coming from the Sun against the layers of the ionosphere at approximately 100 km high.

These particles stimulate the atoms and molecules of the ionosphere, causing the phenomenon of luminescence. As the particles tend to move along the lines of the Earth's magnetic field, towards the magnetic poles, the auroras are most appreciated in the polar regions, from which the name of the northern lights (which manifest themselves in the North Pole) ) and southern auroras (those of the South Pole).

They are presented as a multicolored luminescence in the night sky, which acquires the shapes of flags, bows, crowns, etc. The phenomenon has variable duration from a few minutes to a few hours. It has been found that the auroras are more frequent around the maximum of the periodic cycle of activity of the Sun.

The luminosity of the auroras is classified in four degrees, of which the maximum is compared with the luminosity of the Moon and decreases with the distance from the magnetic poles. The colors, visible only in the fourth grade, are: green, violet, red and yellow.

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