Definitions for kennelly-heaviside layer

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Princeton's WordNet

  1. Heaviside layer, Kennelly-Heaviside layer, E layer, E region(noun)

    a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length

Freebase

  1. Kennelly–Heaviside layer

    The Kennelly–Heaviside layer, named after Arthur E. Kennelly and Oliver Heaviside, also known as the E region or simply the Heaviside layer, is a layer of ionised gas occurring between roughly 90–150 km above the ground — one of several layers in the Earth's ionosphere. It reflects medium-frequency radio waves, and because of this reflection, radio waves can be propagated beyond the horizon. Propagation is affected by time of day. During the daytime the solar wind presses this layer closer to the Earth, thereby limiting how far it can reflect radio waves. Conversely, on the night side of the Earth, the solar wind drags the ionosphere further away, thereby greatly increasing the range which radio waves can travel by reflection, called skywave. The extent of the effect is further influenced by the season, and the amount of sunspot activity.

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