Abstract
IT is now generally recognized1,2 that the high day-time rate of disappearance of electrons in the E- and F-regions of the ionosphere cannot be fully explained by the negative-ion formation theory of Bates and Massey3, which takes account of the electron loss mainly due to attachment. The high value of the recombination coefficient in the E-region and in the upper parts of the D-region has recently been explained by A. P. Mitra and Jones4 on the basis of dissociative recombination of electrons with O2 + and NO+ ions, which are believed to be the principal ionized constituents at the heights of these regions. It may therefore be inquired if the process of dissociative recombination may not also be operative in the high F-regions (F 1 and F 2) and be the determining factor for the disappearance of electrons.
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