Anomalous cosmic ray composition from ACE

Leske, R. A.
June 2000
AIP Conference Proceedings;2000, Vol. 516 Issue 1, p274
Academic Journal
During solar quiet periods, the Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer (ACE) measures the composition and energy spectra of anomalous cosmic rays (ACRs) with energies >8 MeV/nucleon in interplanetary space at 1 AU. In particular, the spectra of individual isotopes for the ACR elements N, O, and Ne are studied with SIS. Intensity enhancements are found in low energy [sup 18]O and [sup 22]Ne, with relative abundances of [sup 18]O/[sup 16]O∼0.002 and [sup 22]Ne/[sup 20]Ne∼0.1. The neon abundance ratio appears more similar to that found in the solar wind than in meteorites and is far below that determined for the galactic cosmic ray (GCR) source, indicating that GCRs contain material from sources other than just the local interstellar medium. © 2000 American Institute of Physics.


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