| 单词 | f-region |
| 释义 | > as lemmasF-region 4. F-layer, F-region: the highest and most strongly ionized layer in the ionosphere; the Appleton 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 1928 E. V. Appleton in Papers Internat. Union Sci. Radio Telegr. 1927 i. 2/1 ‘Reflection’..takes place at an upper layer (F layer) which is richer in ionization. 1930 E. V. Appleton in Proc. Royal Soc. A. 126 550 The normally polarised components of primary, secondary and tertiary downcoming rays from F region would be F1, F2 and F3, etc. 1930 Appleton & Green in Proc. Royal Soc. A. 127 170 During the (a) series [of day-time tests]..out of eight runs there were three on which E layer only was recorded, three on which F layer only was recorded, and two days on which both were recorded simultaneously. 1942 Electronic Engin. 14 632 The F layer..is composed of two parts..the lower part, at about 130 miles' height..and the upper, at 200 miles. 1968 G. M. B. Dobson Exploring Atmosphere (ed. 2) viii. 153 During the night..the ionization of the E region is much reduced, and that of the F1 region is reduced enough to make it indistinguishable from the F2 region and the two become a single F region. < as lemmas |
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