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Measurements of the 16 O and 18 O distribution functions in the solar wind at low to average solar wind speeds from the MASS instrument on the Wind spacecraft are reported. The 16 O/ 18 O density ratio is 450 ± 130, a value consistent with terrestrial, solar photospheric, solar energetic particle, and galactic cosmic ray 16 O/ 18 O isotopic ratios. This study constitutes the first reported spacecraft measurement of the isotope 18 O in the core solar wind and may represent the best determination of the solar 16 O/ 18 O density ratio to date.
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Collier et al. (1998) studied this question.
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