Abstract
PROF. STØRMER'S letter (NATURE, Nov. 3, p. 681), on radio echoes heard from 3 to 15 seconds after the signals, raises some interesting points. If the cause is as he suggests, namely, streams of electrons from the sun, associated with auroræ, the observations would seem to give the first direct evidence yet obtained as to the density of these streams, since the reflection of waves of 31.4 metres, at normal incidence (as is necessary for the signals to return to the earth from a great distance), requires an electron density of the order 105 to 106 per c.c.
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CHAPMAN, S. Radio Echoes and Magnetic Storms. Nature 122, 768 (1928). https://doi.org/10.1038/122768a0
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DOI: https://doi.org/10.1038/122768a0
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