Write short note on ionosphere.
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The ionosphere is an area in the earth's atmosphere which is between the exosphere and the stratosphere. It consists of three layers, which all have the same characteristic of high concentrations of ionized particles. These particles are ionized by radiation from the sun. The ionosphere extends from approximately 50 to 250 miles (80 to 400 km) above the earth's surface.
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it is the fourth layer of atmosphere it is also known as thermosphere
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