Phenomena of Aurora

What is Aurora? Why do auroras occur?  aurora phenomenon is closely related to the interaction between the sun with our earth.Fusion reaction that occurs in the sun, in addition to generating thermonuclear energy, also producepositrons  (e ⁺ ), e-neutrinos ( n _e ), and gamma rays. Additionally, hydrogen nuclei, or protons, helium nuclei, and also some other particles emitted due to radiation pressure is very large. The radiation of charged particles that have high energy from the sun is known as solar wind or solar wind. The particles are moving at a speed 300.000-1000.000 m / s and a density of 0.1 to 30 cm ² .

The solar wind can not directly touch the surface of the earth. This is because the Earth has a magnetic field. In addition, the density of the Earth's atmosphere reaches  10 ¹⁹ particles / cm ³ , making the less likely mencai Earth solar wind particles. However, there are some solar wind particles are able to pass through Earth's atmosphere and hit the air molecules. The collision caused the emergence of brilliant auroras that form of light. The beam created by the air molecules absorb and radiate energy particles back in the form of visible light, the aurora over the north pole is called aurora borealis and that is above the south pole is called aurora australis.

Polar auroras occur because the Earth's magnetic poles are too close to the geographic poles.Earth's north magnetic pole is near the earth and vice versa. Thus the charged particles entering the Earth's atmosphere will move in a spiral trajectory towards the Earth's magnetic poles.