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The sun is the main source of solar wind around the solar system, it always blast out protons and electrons on the nearby planets in almost all the time. Those a wave-like particles will only takes nine minutes to travel, and will arrived on earth atmosphere for about 40 hours. This flux of particles is called the solar wind. It can be thought of as a kind of “evaporation” of particles from the corona. The corona reaches a temperature of about a million Kelvin at a distance of 10,000 km above the photosphere. Luckily, our planet generates its own Magnetic field and act like a magnet. The magnetic field that extends from the Earth’s interior out into space, where it meets the solar wind coming from the sun. The Earth’s magnetic field serves to deflect most of the solar wind, whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation. One stripping mechanism is for gas to be caught in bubbles of magnetic field, which are ripped off by solar winds. After the magnetic field interact with the solar wind, form an elongated cavity in the solar wind. This cavity is called the magnetosphere of the planet. In the vicinity of the earth, the particles of the solar wind are traveling about 400 km/s. The solar wind deflected by the magnetic field of the earth is drawn down into the North and South Pole. Those charged particles react with the atmosphere and create the Aurora Borealis (Northern lights) and Aurora Australis (Southern lights). Actually, the natural magnetic field generated by the earth is a big help to us because dangerous particles don’t hit the Earth’s surface caused by the forces of the magnetic field to move around the Earth. Particles do enter at the funnels over the poles or they gain entry far downstream from the Earth. The particles that enter downstream or at the magnetotail can only cause an auroral light.

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