Aurora is usually seen in polar region of Earth's atmoshere

Solar storm generates majestic planetary light shows in the polar region called aurora. Aurora is like neon sign on enormous scale. In a neon sign electricity introduces charged particle into a gas filled tube. The particles in the gas are excited and start to glow. If the tube has only neon inside it will glow red. If we add other gasses like argon, a whole range of colors can be produced. The neon sign is driven by the electric field inside the tube and the aurora is actually driven by magnetic field energy from the sun.

As the energetic particles in a solar storm stream along earth's magnetic field towards the poles they excite elements in our atmosphere causing them to glow. The color of aurora depends on the gases present in the atmosphere. Oxygen molecules emit green or red color and Nitrogen emits pink, blue and violet color.