Used attributively to designate concepts proposed by Heaviside; esp. Heaviside layer, an ionized layer in the upper atmosphere able to reflect long…
| 单词 | θ8817 |
| 释义 | the world > the earth > weather and the atmosphere > [noun] > specific regions of > specific regions of ionosphere (8) Heaviside layer1911 Used attributively to designate concepts proposed by Heaviside; esp. Heaviside layer, an ionized layer in the upper atmosphere able to reflect long… F-region1928 F-layer, F-region: the highest and most strongly ionized layer in the ionosphere; the Appleton layer. D-region1930 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. E-region1930 Physics. In form E. Denoting a stratum of the ionosphere extending from approximately 90 kilometres to 150 kilometres above the surface of the… sporadic E-layer1937 sporadic E-layer, sporadic-region: a discontinuous region of ionization that occurs from time to time in the E-layer of the ionosphere and results… ledge1949 Meteorology. A layer in the ionosphere corresponding to a point of inflection in a graph of ionization density against height, i.e. a layer in… protonosphere1960 = geocorona n. at geo-, comb._form affix. topside1962 Meteorology. The part of the ionosphere above the height at which the concentration of free electrons is greatest, viz. about 300 km. Frequently… |
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