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Published 2009 | Published
Book Section - Chapter Open

Ionic Charge States Inferred from Elemental and Isotopic Composition in ^3He-rich Solar Energetic Particle Events


Data from the ACE Solar Isotope Spectrometer have been used to study heavy ion elemental and isotopic abundances at energies above 10MeV/nuc in a number of ^3He-rich solar energetic particle events. The isotopic composition observations have revealed a fractionation pattern in which heavy isotopes are enhanced relative to lighter isotopes of the same element as a power law in the ratio of the masses. Adopting the assumption that this represents a special case of a general fractionation law in which different ion species are fractionated as a power law in Q/M , we infer ionic charge state values (Q) for a number of elements and compare them with direct measurements, when available. The relationship between these Q values and the observed elemental fractionation patterns are discussed.

Additional Information

Copyright University of Łódź. Department of High Energy Astrophysics, 2010 We thank Dr. J. Mazur for providing preliminary SAMPEX/LICA charge state measurements for the 20 Aug 2002 event. This work was supported by NASA at Caltech (under grant NX8AI11G), JPL, and GSFC.

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