The true heights of electron density for Washington were computed using the parabolic method for winter, summer, and equinox of 1945 at noon and at midnight. Representative curves were formed by combining the data from a large number of days.
The distributions obtained show a lower height of the maximum electrondensity of the F2 region at midday as compared with midnight. The curves are compared with similar curves for Huancayo, in which the height of maximum ion‐density is greater at midday than at midnight.
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