Solar wind speed alone cannot distinguish open- from closed-field sources; combining helium abundance with cross helicity reveals an overlapping speed range that explains the Alfvénic slow wind.
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Cross Helicity and the Helium Abundance as an in situ Metric of Solar Wind Acceleration
Solar wind speed alone cannot distinguish open- from closed-field sources; combining helium abundance with cross helicity reveals an overlapping speed range that explains the Alfvénic slow wind.