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Short Wave Echoes and the Aurora Borealis


IN the issue of NATURE for Nov. 3 a short note by Prof. Carl Størmer appeared under this title. Prof. Størmer there described the observations made by him and Engineer Jørgen Hals, Oslo, of some remarkable echoes heard several seconds after the original signals—which were emitted from the short wave transmitter PCJJ (λ = 31·4 metre) Hilversum specially for the experiment—reached the receiver at Oslo. These special signals were first sent in March 1928. Since then the experiment has been repeated over and over again, sometimes twice and often four times a week. A continuous watch for these echoes was also kept at Eindhoven, Holland, in two different places, either by myself or an assistant, or by both of us. We did not hear any of these long period echoes for several months.

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VAN DER POL, B. Short Wave Echoes and the Aurora Borealis. Nature 122, 878–879 (1928).

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