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Published September 1, 1999 | Published
Journal Article Open

New observations of heavy-ion-rich solar particle events from ACE


Following launch of the Advanced Composition Explorer in August 1997, the Solar Isotope Spectrometer measured the composition of nine solar energetic particle events. We have used isotopic measurements of Ne to determine the degree of charge-to-mass-dependent fractionation and infer the charge states of C-Ni in the four most heavy-ion-rich of the nine events. The results indicate a source temperature of ∼4×10^6 K; this and the measured abundances suggest that these four events are more characteristic of impulsive events than gradual. Although the ^3He/^4He ratios are not enhanced to the level commonly ascribed to impulsive events, there are sizable enhancements over typical solar wind values measured in three of the events.

Additional Information

© 1999 The American Geophysical Union. Received: May 19, 1999; Accepted: June 23, 1999. Paper number 1999GL900560. This work was supported by NASA at the California Institute of Technology (under grant NAS5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center. We are grateful to the large group of dedicated and talented individuals that contributed to the development of the ACE Mission and the SIS instrument (as acknowledged in Stone et al. [1998]).

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