The upper or F stratum of the ionosphere, above the E (or Heaviside) layer; = F-layer at F, n. 4.
| 单词 | θ76145 |
| 释义 | the world > matter > physics > electromagnetic radiation > radio wave > [noun] > layer reflecting short waves (1) Appleton layer1931 The upper or F stratum of the ionosphere, above the E (or Heaviside) layer; = F-layer at F, n. 4. |
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