E Layer
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E Layer
</dt>
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