| 单词 | d-layer |
| 释义 | > as lemmasD-layer c. D-layer, D-region: the lowest stratum of the ionosphere, occurring between 25 and 50 miles above the earth's surface, below the Heaviside or E-layer. ΘΠ 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 1930 Appleton & Ratcliffe in Proc. Royal Soc. A. 128 155 We therefore attribute the result of the small variation of the reflection coefficient with distance, to the influence of an absorbing zone (D region) of ionisation situated below the region (E region) in which the main bending takes place. 1930 Appleton & Ratcliffe in Proc. Royal Soc. A. 128 155 Rays which travel to the more distant receiving stations have a longer path through the D region. 1935 Nature 8 June 953/2 Besides these two main regions [F and E], the existence of a so-called D or absorbing layer has been suggested. 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. 1955 Sci. Amer. Sept. 128/2 The lowest stratum of the ionosphere is called the D layer. Its electron density has not been measured accurately but is known to be low, because the layer does not reflect radio waves of one megacycle per second or higher frequency. 1968 G. M. B. Dobson Exploring Atmosphere (ed. 2) viii. 151 These radio waves will be absorbed as they come down through the D region. < as lemmas |
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