An investigation of recombination in the nighttime F region is described in which use was made of electrondensity profiles of the region up to the maximum of the layer obtained from ionosonde records. Several models of the region above the maximum are compared to reconstruct the entire profile. Profiles of the F layer are reconstructed for several successive hours during the night. The recombination coefficient is then assumed to vary as a function of height in accordance with the scale height of either molecular oxygen or molecular nitrogen, and values of the recombination coefficient at 300 km are calculated. Marked percentage changes of BETA with temperature, of the same order as current estimates of the changes in neutral-particle density with temperature, are observed. Estimated values of BETA as a function of temperature are presented.
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Nisbet et al. (1963) studied this question.
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