About auroras?

Question

whenever a charge particle enters a magnetic field it moves in acurve path , so earth is surrounded by a magnetic field and whenever a charge particle from the sun reaches this field it excites oxyg and nitro gases and due to which colours are given out but my exact question is that why do we see the colours near the poles?

Answer 1

Auroras are rapidly shifting patches and streams of coloured lights appearing in the night sky, usually in winter and usually at latitudes above 60° north or south. In the northern hemisphere this phenomenon is called aurora borealis; in the southern hemisphere it is called aurora australis. Auroras occur when charged particles in the solar wind interact with gases in the Earth's atmosphere. Seen from space, auroras have a characteristic ring shape.


The electrons and protons penetrate the magnetosphere of the Earth and enter the lower Van Allen radiation belt, overloading it. The excess electrons and protons are discharged into the atmosphere over an area centring on the north and south magnetic poles and extending about 20° from them. These particles then collide with gas molecules in the atmosphere, thereby exciting the molecules and causing luminescence, the emission of visible light.

Answer 2

The earth is like a stick sticking up in a river and the solar winds form a wake around the earth . The magnetic field goes quite a ways out in space and the particles are attracted to the poles,it doesn't attract all to the poles.many impact the entire earth but much more at the poles. The bata particles are attracted to the north pole and charges it negative. the alpha particles are attracted to the south pole and it is positive. The earth is like a Hugh battery and that in tern ionizes the Van Allan belt which protects us from radiation. U always hearing about the ionized layer not protecting us from the radiation. The ionized layer repair system is almost instant. The alpha particles get through and hits the nitrogen which transmutates to o3,which restores the ozone layer.

Answer 3

Aurora is the name given to ghostly lights that appear in the skies of the Earth towards the polar regions. In the north, they are called aurora borealis (northern lights). In the south, aurora australis
The colours of auroras vary depending on the height at which most of the collisions occur. Street lamps and 'neon' signs emit different colours of light due to the types of gas inside them. The same applies to auroras. Image
Auroras are caused be the Sun's solar wind, a continuous stream of charged particles that heads out into the solar system. When these particles reach the Earth, they are deflected towards the North and South poles by its magnetic field. The particles then hit the atmosphere, and cause the shimmering lights to appear
If the predominant gas is oxygen, as it is above 300 km altitude, auroras will be red. This is rare, and only occurs at times of maximum solar activity. The most common colour is yellow or green, again caused by oxygen, but at lower altitudes. Nitrogen at about 100 km produces a red light often seen at the lower edges of auroras

Answer 4

The Auroras are caused due to collision of magnetically charged dust particle with solar particles. These charged protons are maximum at the north and south poles. The solar particles also travel closer to the poles and react with the oxygen and nitrogen gases in the earth's upper atmosphere
Aurora Australis creates Purple colours, normal auroras produce blue and maroon colours

Answer 5

The particles travel down the magnetic flux lines to the geomagnetic poles. We have a north magnetic pole and a south magnetic pole. When the charged particle hit the atmosphere, it comes into contact with the gases in the atmosphere. The charged particle colision with the gas molecules emits a photon.

Answer 6

The concentration of the magnetic fields near the poles is highest and strongest. Hence auroras are seen there.

Answer 7

Because the magnetic field near the poles is strongest

Answer 8

Because the field goes down to almost zero there, that's the weakest part, and they can follow the lines there as they penetrate down through the upper atmosphere.

In fact, there is a low-grade aurora going on all the time, all over the world, but much dimmer. It's called airglow.

Answer 9

Different gases emit light of different wavelengths. Hence the colours.

Answer 10

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