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Extended ³He-rich Periods of Solar Energetic Particles in Structured Solar Wind

Mason, G. M.; Kocharov, L.; Laivola, J. +2 more

We have surveyed helium isotope abundance data (1997-2005) measured with the Ultra-Low-Energy Isotope Spectrometer (ULEIS) on the Advanced Composition Explorer (ACE) and have found multiday periods of ³He-rich solar energetic particles (SEPs) in the energy range of ~0.4-10 MeV nucleon^-1 with ³He/⁴He ~ 0.…