What are Northern Lights I Polar Lights I Aurora Borealis Aurora Australis Causes of Northern Light смотреть онлайн

WHAT ARE NORTHERN LIGHTS?
The northern lights are an astronomical phenomena which is also called polar lights. They are curtains of colored light which is visible on occasion in the night sky.
The bright dancing lights of the aurora are actually collisions between electrically charged particles from the sun that enter the earth's atmosphere. The lights are seen above the magnetic poles of the northern and southern hemispheres. They are known as 'Aurora borealis' in the north and 'Aurora australis' in the south..
Auroral displays appear in many colours although pale green and pink are the most common. The lights appear in the form of patches,scattered clouds of lights, streamers, arcs, rippling curtains or shooting rays that light up the sky
WHAT CAUSES THE NORTHERN LIGHTS?
The Northern Lights are actually the result of collisions between gaseous particles in the Earth's atmosphere with charged particles released from the sun's atmosphere. Variations in colour are due to the type of gas particles that are colliding.
The temperature above the surface of the sun is millions of degrees Celsius. At this temperature, collisions between gas molecules are frequent and explosive. Free electrons and protons are thrown from the sun's atmosphere by the rotation of the sun and escape through holes in the magnetic field. Blown towards the earth by the solar wind, the charged particles are largely deflected by the earth's magnetic field. However, the earth's magnetic field is weaker at either pole and therefore some particles enter the earth's atmosphere and collide with gas particles. These collisions emit light that we perceive as the dancing lights of the north (and the south).

The lights of the Aurora generally extend from 80 kilometres to as high as 640 kilometres above the earth's surface.
The best places to watch the lights are in the northwestern parts of Canada, Alaska, the southern tip of Greenland and Iceland, the northern coast of Norway and over the coastal waters north of Siberia.


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Что такое северное сияние I Полярное сияние I Aurora Borealis Aurora Australis Причины северного сияния

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什么是北极光我的极光我的北极光北极光的原因
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