Abstract
PROF. E. V. APPLETON1 has described a method of measuring the maximum ionisation existing in the lower region of the ionosphere. It is clear from recent work2,3,4 that, in order to investigate ionospheric fine-structure in sufficient detail, our technique must be improved along at least two lines:—(1) The time taken in making a measurement of ionisation density should be as short as possible. (2) Measurement of the equivalent path of the atmospheric rays should be made over a frequency range which is continuous.
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References
Appleton, NATURE, 127, 197, Feb. 7, 1931.
Appleton, Proc. Phys. Soc., 45, 673; 1933.
Appleton and Naismith, Proc. Phys. Soc., 45, 389; 1933.
Schafer and Goodall, NATURE, 131, 804, June 3, 1933.
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NAISMITH, R. Methods of Ionospheric Investigation. Nature 133, 66 (1934). https://doi.org/10.1038/133066a0
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DOI: https://doi.org/10.1038/133066a0
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