Statistical Study and Live Catalog of Multispacecraft ³He-rich Time Periods over Solar Cycles 23, 24, and 25

Using ion measurements from Ultra-Low-Energy Isotope Spectrometer (ULEIS) observations onboard Advanced Composition Explorer (ACE) and Solar (SIS) the Terrestrial Observatory (STEREO)-A STEREO-B spacecraft, we have identified 854 3He-rich time periods between 1997 September 2021 March. We include all event types with observed 3He enhancements such as corotating interaction regions (CIRs), gradual solar energetic particle (SEP) events, interplanetary shocks, impulsive SEP events. employ two different mass separation techniques to obtain 3He, 4He, Fe, O fluences for each event, determine 3He/4He Fe/O abundance ratios 0.32 0.45 MeV/nucleon 0.64 1.28 MeV/nucleon. find a clear correlation in both energy ranges. distinct trends vs. relation. For low values, there is positive linear Fe/O. However, at ~ 0.3, appears reach limit weakens significantly. provide live catalogue of rich that includes robust determination onset end times SEP-associated events my multiple spacecraft. This available public use. New releases will follow after major additions adding new missions (e.g., Parker Probe Orbiter), identifying (impulsive etc.), or parameters remote detailing characteristics active regions.