Abstract
BOTH Prof. Appleton and Dr. van der Pol have suggested in letters in NATURE of Dec. 8 that the echoes observed by Prof. Størmer with delays of about ten seconds might be explained by the disturbance spending a long time in a region containing so many electrons per c.c. that the group velocity of the disturbance was very small.
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References
Hrdlicka, Annual Report of the Smithsonian Institution, 1913, p. 522.
Bull. Soc. préhist. de France, 1907–8 (two papers).
"Antiquity of Man in East Anglia". Camb. Univ. Press, p. 87, Fig. 35.
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THOMAS, L. Short Wave Echoes and the Aurora Borealis. Nature 123, 166 (1929). https://doi.org/10.1038/123166a0
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DOI: https://doi.org/10.1038/123166a0
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