Why Aurora Appears?

1) as a result of shooting from the sun to come close to the electronics of the deflection magnetic field, and concentrated into a spiral around the magnetic poles arising from the convergence effect. For the adoption of very thin and most of cold high gas discharge, resulting in the magnificent atmosphere luminous phenomenon. The shape of arch-arc, and so long with the mist, the state was from the beating, blinking into the explosion have. Aurora is usually white in color with green, with red, yellow, blue, with purple or pink, the duration from hours to several days ranging from 

   (2) why the aurora is only seen in the polar regions of Earth? Original Earth has a strong magnetic field, charged particles from the sun by the impact of the Earth's magnetic field, as the magnetic lines of the effects of convergence, the electronics and positive ions are posed by the gas (we call him for plasma) will be along the direction of the Earth's magnetic field lines generate a positive electric field, so the electronic plasma were accelerated in this field, enter the high latitudes of the ionosphere, so the only shooting at the polar regions of charged particles into the upper atmosphere can produce auroral . 

  (3) Geomagnetic North Pole in Canada (Geomagnetic North Pole from the geographic North Pole about 1200km away. Whichever is the center of the earth intersect about 11.5o.), It is in the northern part of southern Canada and the United States, common to the Aurora, Siberia low magnetic latitude to see less. Usually the higher the magnetic latitudes in order to see the Northern Lights, but closed on the intensity of solar storms in slightly lower magnetic latitudes can be seen. 

 Scientists have been able to correctly predict the eleven years for the cycle of solar storms, a large number of solar storms from the charged particles toward Earth, and to the interaction of the magnetic field produced splendid scenery of the Northern Lights. Eleven year cycle of the millennium coincides with the peak at slightly lower magnetic latitudes can be seen. . 

  (4) located in the Arctic known as the Northern Lights, is located in the Antarctic, known as the southern lights, just as the head angel halo general, set in the Earth polar night sky. Northern Lights and the Antarctic light can sometimes be like as the mirror image pairs.