Preliminary Results on the Isotopic Composition of Anomalous Cosmic Rays from the ACE Solar Isotope Spectrometer

Details Preliminary Results on the Isotopic Composition of Anomalous Cosmic Rays from the ACE Solar Isotope Spectrometer Preliminary Results on the Isotopic Composition of Anomalous Cosmic Rays from the ACE Solar Isotope Spectrometer

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..apr..c802l&link_type=abstract

American Physical Society, APS/AAPT Joint April Meeting, April 18-21, 1998 Columbus, Ohio, abstract #C8.02

Physics

Scientific paper

The Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer (ACE) measures the elemental and isotopic composition of energetic nuclei from He to Ni (2<= Z<=28) over an energy interval of ~10 to 100 MeV/nucleon. During solar quiet times, the particle fluxes at the low energy end of this interval are dominated by anomalous cosmic rays (ACRs). SIS has a large geometry factor of ~40 cm^2sr, which allows it to collect roughly 5000 ACR O nuclei (<= 40 MeV/nucleon) per month. We present measurements of the elemental and isotopic composition of ACR N, O, and Ne obtained since the turn--on of SIS on August 27, 1997, including spectra for the individual isotopes of these elements. We compare our results with those found by previous investigations, particularly the recent measurements from the SAMPEX satellite, and discuss the implications for the isotopic composition of the local interstellar medium and the nature of the galactic cosmic ray source. This work was supported by various NASA contracts and grants at Caltech, JPL, and GSFC.

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