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Analysis of GCR Spectra and Composition Using Penetrating Particle Data from the CRIS Instrument on ACE

Wiedenbeck, M. E. and Binns, W. R. and Christian, E. R. and Cummings, A. C. and Davis, A. J. and de Nolfo, G. A. and Israel, M. H. and Labrador, A. W. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. (2015) Analysis of GCR Spectra and Composition Using Penetrating Particle Data from the CRIS Instrument on ACE. In: 34th International Cosmic Ray Conference (ICRC2015). Proceedings of Science. No.236. SISSA , Trieste, Italy, Art. No. 340.

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The Cosmic Ray Isotope Spectrometer (CRIS) on NASA’s Advanced Composition Explorer (ACE) spacecraft has been making precise measurements of cosmic-ray elemental and isotopic composition and energy spectra for nearly 18 years. This instrument uses the dE/dx versus total energy technique to identify nuclei that stop in thick stacks of silicon solid-state detectors and to measure their energy. The energy range covered for these stopping particles extends up to ∼280 MeV/nuc for O and ∼570 MeV/nuc for Fe. We have developed a new technique for identifying particles that penetrate the entire detector stack that relies on a combination of the total energy deposited in the stack and the change of dE/dx from the front to the back of the stack. This technique allows us to extend energy spectra for cosmic-ray elements to higher energies and can be used for bridging the energy gap between the CRIS stopping-particle spectra and measurements made in low-Earth orbit by instruments such as HEAO-C2, PAMELA, and AMS-02. We describe the technique for assigning atomic number and energy to penetrating particle events and discuss the corrections needed for deriving energy spectra from these data.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Wiedenbeck, M. E.0000-0002-2825-3128
Binns, W. R.0000-0001-6110-3407
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
de Nolfo, G. A.0000-0002-3677-074X
Israel, M. H.0000-0002-8104-208X
Labrador, A. W.0000-0001-9178-5349
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Additional Information:Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike. We thank Nathan Yanasak, Jeff George, and Kelly Lave for their extensive work on obtaining elemental spectra from the CRIS stopping particle data and in developing the corrections needed for deriving cosmic-ray intensities. This work was supported by NASA at JPL, Caltech, Washington Univ., and NASA/GSFC.
Funding AgencyGrant Number
Washington UniversityUNSPECIFIED
Series Name:Proceedings of Science
Issue or Number:236
Record Number:CaltechAUTHORS:20180828-122925525
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89239
Deposited By: George Porter
Deposited On:30 Aug 2018 21:45
Last Modified:09 Mar 2020 13:19

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