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.
It tells the story of a tribe of cats called the Jellicles and the night they make what is known as 'the Jellicle choice', where they decide which cat will ascend to the Heaviside Layer and come back to a new life.
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.
Lewis' The Chronicles of Narnia") via a stair-climbing ritual that, for theater geeks, calls to mind Grizabella ascending on a tire to the Heaviside Layer in Andrew Lloyd Webber's "Cats.
Old Deuteronomy, their wise and benevolent leader, announces which of them will go up to The Heaviside Layer and be reborn into a whole new life.