A Comparison of the Electron Density Variations in the F2 Region at Kokubunji and Yamagawa during the Night

Abstract

By comparing the electron density variations in the F2 region during the night at Kokubunji and Yamagawa it has been made clear that, if we assume a linear law of electron disappearance and some-what higher temperature of the upper atmosphere at Yamagawa than at Kokubunji, the observational data fit theoretical expectation rather well, but a quadratic law can hardly be reconciled with the observations, unless recombination coefficient changes markedly with height.