The ion composition experiment aboard the Isee 3 spacecraft has been used to measure the 4 He ++ /³He ++ ratio in the solar wind. Using 4334 observations made between August 18 and November 24, 1978, and March 24 and August 25, 1979, the average ratio 4 He ++ /³He ++ is found to be 2.1±0.2 × 10³, in agreement with previous foil measurements. Individual observations vary widely from the average and the low 4 He ++ /³He ++ ratios occur at times of low 4 He ++ flux.
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Ogilvie et al. (1980) studied this question.
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