Abstract
The variations of electron density during the annular solar eclipse of 25 December 1954 for various fixed heights in the F1 and F2 layers of the ionosphere are compared with the variations expected under alternative assumptions that the removal of free electrons is by recombination and attachment. The recombination and attachment coefficients so deduced do not vary with height in the F1 layer, and it would appear that the recombination process is predominant in this region. In the F2 layer, the recombination and attachment coefficients decrease with height in a regular manner and are compared with values obtained by other workers.
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