Abstract

A dispersion radiointerferometer was used in conjunction with sounding rockets to determine the electron concentrations from the difference in phases of coherent oscillations emitted from the rockets. Three curves on a height vs electron concentration graph are given for rocket firings on July 14 and 22, 1959, and June 15, 1960. It is concluded that the electron concentration increases almost steadily in the ionosphere illuminated by the sun at heights up to 200 km with small maxima in the region of 100 to 125 km. (D.L.C.)

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