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The ionosphere is a part of the upper atmosphere, from about 85 km to 600 km altitude, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth.
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- (Tech) vùng (trường) D
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◊ (Tech) ▪ vùng (trường) D
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ناحیه ی دی ، پایین ترین لایه ی یونوسفر در جو زمین با چگالی الکترون آزاد کم و منعکس کننده ی امواج رادیویی بالاتر از 50kHz
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D-layer: The lowest region of the ionosphere found approximately 25 to 55 miles above Earth; it fades away quickly after sunset and sometimes does not form at all on short winter days. The main impact of the D-layer on radio propagation is to absorb energy from signals passing through it. -- See URL: Propagation
| D-region in English | D-region in Farsi
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