E Layer

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E Layer

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A division of the ionosphere, usually found at an altitude between 100 and 120 kilometers in the E-region. It exhibits one or more distinct maximums and sharp gradients of free electron density. It is most pronounced in the daytime but does not entirely disappear at night. Also called E1 - layer, Kennelly-Heaviside layer, Heaviside layer. See sporadic E-layer (under ionosphere), atmospheric shell, ionosphere. </dd>
There is some evidence to indicate a second layer above the normal E-layer located at about 150 kilometers, and called the E2-layer. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use