Abstract
WE were much interested in a recent communication1 in which Mr. T. L. Eckersley described the way in which he had measured the collisional frequency of electrons in the F1 region of the ionosphere by comparing the absorption coefficients and group retardations of returned echoes. It is a well-known fact that the effects of the F1 region are only evident during the hours of daylight, and this presumably accounts for the fact that Mr. Eckersley's observations were made between 1550 and 1630 hr., that is, about one hour before sunset.
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References
NATURE, 135, 435, March 16, 1935.
Proc. Roy. Soc., 141, 710; 1933.
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FARMER, F., RATCLIFFE, J. Frequency of Collision of Electrons in the Ionosphere. Nature 135, 585 (1935). https://doi.org/10.1038/135585b0
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DOI: https://doi.org/10.1038/135585b0
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