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PA2RHB > TECH 07.02.04 14:55l 35 Lines 1265 Bytes #999 (0) @ WW
BID : 230281PA2RHB
Read: DJ9AO DB0FHN GUEST OE7FMI
Subj: Re: KB2VXA > Appleton
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Sent: 040207/1350Z @:PI8WFL.#NH1.NLD.EU #:51780 [Enkhuizen] $:230281PA2RHB
From: PA2RHB@PI8WFL.#NH1.NLD.EU
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> frankly I had no idea that anyone had a layer of
> the ionosphere named after him.
Actually, at least three persons have there names associated with the
ionosphere.
In 1902 Oliver Heaviside and A.E.Kennelly had independently postulated the
theory of a conducting layer of the atmosphere: the Kennelly-Heaviside
Layer.
Appleton conducted an experiment to prove whether the Heaviside layer
existed, and its height - about 100 kilometres. The ionosphere was the
first 'object' detected by radio-location, a technique that developed into
the radar under Robert Watson-Watt.
However, the experiments demonstrating the existence of a reflecting layer
produced more questions than answers. During experiments designed to
tackle some of these questions, Appleton discovered another layer 250-350
kilometres high. He found that this layer reflected back shorter
wavelengths in daytime as well as at night, and that they were reflected
back with greater strength than the Heaviside layer. Appleton realised
that this was the layer responsible for reflecting short wave radio round
the world - 'the Appleton layer'.
Rudolf, PA2RHB
Heemskerk JO22im
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