| 单词 | e-layer |
| 释义 | > as lemmasE-layer h. In form E. Denoting a stratum of the ionosphere extending from approximately 90 kilometres to 150 kilometres above the surface of the earth, and which reflects medium frequency radio waves; = Heaviside layer at Heaviside n. More fully E-layer, E-region. ΘΚΠ the world > the earth > weather and the atmosphere > [noun] > specific regions of > specific regions of ionosphere Heaviside layer1911 F-region1928 D-region1930 E-region1930 sporadic E-layer1937 ledge1949 protonosphere1960 topside1962 the world > matter > physics > electromagnetic radiation > radio wave > [noun] > layer reflecting long or waves Heaviside layer1911 E-layer1930 sporadic E1937 sporadic E-layer1937 1930 E. V. Appleton in Proc. Royal Soc. 1929–30 A. 126 550 Let us call the region of ionisation which normally reflects long waves, and which normally deflects the primary, downcoming waves on broadcasting wave-lengths, the E region. 1934 Proc. IRE 22 483 Appleton and Green..concluded that the two layers, E and F, existed both day and night. 1935 Nature 8 June 953/2 The appearance of echoes from the D layer is closely connected with the weakening of echoes from the E layer. 1959 R. D. Davies & H. P. Palmer Radio Stud. Universe ix. 162 Far below the F-region is the E-region which is centred at a height of 110 km. 2006 Science 24 Nov. 1254/2 The maximum electron density of the E-layer and the F1-layer increased slightly. < as lemmas |
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