Aurora - this is one of the most beautiful natural phenomena.Basically it is possible to observe in a green or blue-green color in the form of clouds, bands and spots.There are cases where clearly visible shades of pink and even red.The so-called tape appear in the sky with intense radiance.They hang on the dark sky like a huge curtain or drape on the beautiful landscape.When the power of this natural phenomenon is reduced, ribbons turn into spots, and sometimes disappear altogether.
Stretch they generally from west to east at an altitude of hundreds of kilometers.A small thickness of this amazing "curtain" (several hundred meters) allows you to see with the naked eye through a star.The lower edge of the tape aurora becomes clear red or pink hue, and the top - gradually dissolves in the height of the dark sky, creating a superior effect of depth and infinity of the universe.
Auroras come in several forms: the radiant arc (tape, which could become active, the motion forming small folds), homogeneous arc (luminous band, which has the simplest form, bright, but with the increase gradually disappearing) and radiant strip (formed by the high activity when large folds of this natural phenomenon superimposed smaller).
There aurora, not related to any of these species.Its activity is very high, since it is generated by solar energy.This glow is shaped like hats, whitish-green hue, it extends over the entire polar region called squall.
in brightness, these natural phenomena can be divided into four types.After all, in the shade, they differ from each other ten times, creating a multi-colored aurora borealis.Photo testify to this, as they can clearly see the difference in intensity.The light from the faintest glow barely noticeable, but from the very strong - like the light of the moon.The process proceeds it arrives at a speed of 1 km / sec.Thus there is a heating outbreaks in atmosphere, and it rushes up.This aurora is eddy electrical currents that capture a large part of the atmosphere and contributes to the unstable magnetic field, causing magnetic storms.
homogeneous structure for this phenomenon is the main form, and all the folds and loops - this is just a reaction to the increase in activity, an increase which they expanded to an enormous size, and with a decrease - disappear altogether.In addition, when the flash intensity aurora is always accompanied by a sound like noise and crackling in the autumn forest.Similar shine effect on the ionosphere, changing it.Such changes may lead to a bad radio environment or to its absence.
Thus, it is safe to conclude that the aurora - is the most beautiful, magnificent and unique natural phenomenon.It is a real miracle of our planet, which still pleases, surprises and carries a lot of secrets and mysteries.