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Published 1999 | Published
Book Section - Chapter Open

Characteristics of 3He-Rich Energetic Particle Events Observed with the SIS Instrument on ACE


We report observations of ^3He-rich solar energetic particle (SEP) events made with the Solar Isotope Spectrometer (SIS) aboard the Advanced Composition Explorer (ACE) spacecraft. SIS has been measuring helium isotopes above ~ 4 MeV /nucleon since August 1997 using a dE/dx vs. totalenergy sensor system employing large-area silicon solid-state detectors. We show examples of the helium isotope data being collected by SIS. Using data such as these it is possible to characterize the properties of ^3He-rich events including isotopic abundances, intensities, spectral hardness, and timing characteristics. These data can be correlated with other sources of information for the same events including particle measurements made at lower energies and observations of electromagnetic radiations from the flare site. Results of these types of analyses will be presented at the conference.

Additional Information

© University of Utah. Provided by the NASA Astrophysics Data System. This research was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center.

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August 19, 2023
October 20, 2023