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The lowest layer of the ionosphere, able to reflect low-frequency radio waves.
‘They will penetrate to the D-layer and increase the ionisation process and the electron density.’
‘The ionospheric D-layer is a narrow bandwidth radar target often with a very small scattering cross section.’
‘Simply due to the height difference of the ‘responsible’ layer, troposcatter is useful up to distances of 700 Km, whereas D-layer is at best in the 600/1300 Km range.’