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InterviewSolution
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Define important terms used in ionospheric propagation. Define single hop distance. |
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Answer» Ionosphere is the layer of ions at a height of 50 km to 400 km formed due ionisation by ultraviolet radiations from the sun. D layer of ionosphere is at a height of 70 km which has a thickness of 10 km. It disappears at night and reflects VLF and LF waves. E layer of ionosphere is at a height of 100 km and has a thickness of 25 km. It disappears at night and helps MF and HF wave propagation. F layer is at a height of 150 km and extends upto 400 km. It remains during both day and night . time. During day time, it splits into two layers F1 and F2 and combines to form a single F layer during night time. F1 layer or kennelly-Heaviside layer is at a height of 200 km with a thickness of 20 km. reflects HF waves. F2 layer or Appletion layer is at a height of 300 km and has a thickness of 20 km. It is usefull in HF wave propagation. |
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