D-layer

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Noun1.D-layer - the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
D region
ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons
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References in periodicals archive
On removal of D-layer (water table depth layer) a visual increase in the vulnerability index of the central part of the study area has been observed and is shown in Fig.
Assessment of the intrinsic vulnerability to groundwater contamination in Lahore, Pakistan
Equation (b) has been used, as a profile of the E region, to separate D-layer and E-layer absorptions.
Scientific review on the ionospheric absorption and research prospects of a complex eikonal model for one-layer ionosphere
At very low frequencies (VLF, generally below 30kHz) it is the ionospheric D-layer, between 50 to 90km in altitude, which is responsible for long distance radio propagation, with the X-ray and high energy UV from the Sun providing the ionising energy.
An introduction to solar radio astronomy
Mark calculates that this flare pushed the ionosphere D-layer downwards by about 4km.
The Radio Astronomy Group in 2010
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