The results are presented of ionosphere measurements made in the region of totality during the eclipse of July 9, 1945. An analysis of the results shows effective recombination coefficients of 1.6 × 10 −8 for E region, 1.4 × 10 −8 for F 1 region, and 1.0 × 10 −9 for F 2 region. Evidence of a variable coefficient for E region agrees with the suggestion of Massey and others of a high negative ion density at this level.
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C. W. McLeish (1948) studied this question.
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