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单词 E layer
释义
E layer

Astronomy
  • A component of the Earth’s ionosphere, at an altitude of 110 km; also known as the Heaviside layer after the English physicist Oliver Heaviside (1850–1925). It is used as a reflective surface by radio operators. Electron densities in the E layer show diurnal variation, being greater during daytime. Absorption of radio waves by the denser daytime E layer can be a problem. Localized patches of sporadic E ionization which commonly appear at the same atmospheric level during the summer months can also disrupt short-wave radio communication.


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