Abstract
GRAPHS showing the hourly variations in the (square of the) critical penetration frequency (/2) of radio waves for the Gx ionizing region of the atmosphere, located at a height of 55 km., are given by Dr. H. Rakshit and J. N. Bhar. Prof. Mitra, commenting on one of their remarks, points out that the critical penetrating frequency cannot be taken as a measure of the density of ionization since it depends upon both ionization density and upon collisional frequency, which vary independently.
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Points from Foregoing Letters. Nature 138, 292 (1936). https://doi.org/10.1038/138292b0
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DOI: https://doi.org/10.1038/138292b0