In telecommunication, effective Earth radius is the radius of a hypothetical Earth for which the distance to the radio horizon, assuming rectilinear propagation, is the same as that for the actual Earth with an assumed uniform vertical gradient of atmospheric refractive index.
For the standard atmosphere, the effective Earth radius is 4/3 that of the actual Earth radius. The ratio of the effective Earth radius to the actual Earth radius is called the k factor.
Famous quotes containing the words effective and/or earth:
“The only effective way to help well-intentioned, intelligent persons to do the best they can in raising children is to encourage and guide them always to do their own thinking in their attempts at understanding and dealing with child-rearing situations and problems, and not to rely blindly on the opinions of others.”
—Bruno Bettelheim (20th century)
“Alas! While your ambitious vanity is unceasingly laboring to cover the earth with statues, with monuments, and with inscriptions to eternalize, if possible, your names, and give yourselves an existence, when this body is no more, why must we be condemned to live and die unknown?”
—Thomas Paine 1737–1809, U.S. writer and magazine editor. Pennsylvania Magazine, pp. 362-4 (1775)