Heaviside layer


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Heaviside layer

[′hev·ē‚sīd ‚lā·ər]
(geophysics)

Heaviside layer

Heaviside layerclick for a larger image
A layer of ionized particles that surrounds the earth. The layer, also called the E layer, has ionization of around 106 free electrons. The layer is found at a height of around 60 to 90 miles (100-150 km), but its height varies according to the seasons and during the day and at night. The Heaviside layer reflects relatively long, low-frequency radio waves ranging from 100 kHz to 20 MHz. Also called the Kennelly-Heaviside layer and the E region of the atmosphere.
References in periodicals archive ?
The cats all get together once a year to send one cat up to the heaviside layer, heaven, to be given a new life, as cats have nine lives.
The narrative sees the Jellicle cats gather in a scrapyard for their annual ball, where one lucky puss is chosen by leader of the pack Old Deuteronomy (here played by a wise and furry Nicholas Pound) to ascend to the Heaviside layer to be reborn.
It's the night of the Jellicle Ball when the cats gather in an old scrapyard to choose who is to go up to the Heaviside layer and be re-born.