“F2 layer”的概念、定义、翻译、参考文献-科学参考

单词	F2 layer
释义	F2 layer (F₂ layer) [¦ef `tü ´lā·ǝr] ^GEOPHYSICS The highest constantly observable ionosphere layer, characterized by a distinct maximum of free-electron density at a virtual height from about 135 miles (225 kilometers) in the polar winter to more than 240 miles (400 kilometers) in daytime near the magnetic equator. Also known as Appleton layer.
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