AURORA BOREALIS

Aurora Borealis wonder of nature

What is Aurora?
Aurora Borealis creates ghostly lights and a natural event which is caused by collisions between fast-moving electrons and the oxygen,nitrogen in Eatrh’s upper atmosphere. The electrons comes from the magenitosphere(the region which is controlled by Earth’s magnetic field)transfers energy to the oxygen and nitrogen gasses,making them excited. And when these particles “calm down” they emit protons, small brust of energy in form of light. When large number of particles emits protons this light is detected by human eye.

Aurora is seen with different color,shapes.Aurora is also seen in Saturn,Jupiter and Uranus.Any planet with a magnetic field and an atmoshphere should likely have auroras. Aurora Borealis also known as Northern Light.

Picture of Mechanicsm of Aurora

Where can the Aurora being seen?
It occurs in the ring shape areas magnetic poles of earth. The best place for observing Aurora is Canada,Alaska,Greenland,northern Scandivia,Russia.In the region of Alaska this light is called Aurora Australialis.In rear case this light is seen South Florida & Tesax.From upper space the light seems as ring.



Shapes of Aurora:
The Aurora could be seen in to different shapes. Some times just like cloud,oval,elipse,circle.Actually scietienst are not sure why different shapes produce. But it is said that the shape of Aurora depends on electron source from magnetosphere and on the process that cause electrons into atmosphere.

Aurora near Alaska

Why the different colors?
Actually colors of Aurora mostly depends on the particles.If Nitrogen gives off a blue light,if the Oxygen then emits greenshis-yellow light. Some of the cloros of Aurora are not detected by human eye but detected by specal cameras.



Common myths about Aurora:

1.Aurora light is emmited from moon.
2.Aurora is reflected from the sunlight which is reflected my the ice caps.
3.Aura are caused by arriving dirictly from the Sun and guided by Earth’s magnetic field in to polar atmosphere.

For more information:

1.http://www.phy6.org/Education/Intro.html
2. http://istp.gsfc.nasa.gov/istp/outreach

References:
http://istp.gsfc.nasa.gov/istp/outreach
http://wikipedia.com


Idea by:Dr.Humyun Kabir
Asst. Professor Deptt. Of CSTE

Written by:M.Mushfiq-E Mahabub
5th Semester Deptt. Of CSTE,NSTU