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Published September 1, 1999 | Published
Journal Article Open

Event-to-event variations in the isotopic composition of neon in solar energetic particle events


Using the Solar Isotope Spectrometer on the Advanced Composition Explorer, we have measured the isotopic composition of neon at 24–72 MeV/nucleon in nine solar energetic particle events between 4 November 1997 and 16 November 1998. The ^(22)Ne/^(20)Ne ratio varies from ∼0.7 to ∼2 times the solar wind value from event to event, indicating significant mass fractionation in the acceleration and/or transport of these particles. The mass fractionation is strongly correlated with the Fe/O and Na/Mg element abundance ratios, suggesting that elemental and isotopic fractionation are both governed by the ionic charge to mass ratio.

Additional Information

© 1999 The American Geophysical Union. Received May 19, 1999; Accepted June 23, 1999. Paper number 1999GL900561. 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. We are grateful to the large group of dedicated and talented individuals who made the ACE mission possible and contributed to the development of the SIS instrument (as acknowledged in Stone et al., [1998]).

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