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Recent Results from the Cosmic Ray Isotope Spectrometer on NASA's Advanced Composition Explorer

Wiedenbeck, M. E. and Binns, W. R. and Israel, M. H. and Leske, R. A. and Christian, E. R. and Cohen, C. M. S. and Cummings, A. C. and Davis, A. J. and de Nolfo, G. A. and Labrador, A. W. and Lave, K. A. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. (2017) Recent Results from the Cosmic Ray Isotope Spectrometer on NASA's Advanced Composition Explorer. In: 35th International Cosmic Ray Conference (ICRC2017). Proceedings of Science. No.301. SISSA , Trieste, Italy, Art. No. 1089.

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The Advanced Composition Explorer (ACE), which carries instrumentation for making high-precision measurements of the charge and mass of energetic nuclei between ∼1 keV/nuc and ∼1 GeV/nuc, was launched in August 1997 into an orbit about the L1 Lagrangian point 1.5 million km sunward of the Earth. From this vantage point, ACE collects data that are used for a wide range of studies in galactic and heliospheric physics. The ACE spacecraft and instruments are, for the most part, continuing to perform very well and to extend their data sets. The long mission duration, which is already almost an order of magnitude greater than the two years that was nominally required of ACE, has made it possible to address science topics beyond those envisioned when the mission was proposed. In this paper we address several topics to which ACE’s Cosmic Ray Isotope Spectrometer (CRIS) is contributing in the area of galactic cosmic radiation. CRIS has been able to make measurements of extremely rare species, including the primary radioactive nuclide 60Fe and a number of stable “ultraheavy” elements with atomic numbers in the range Z=30 to 40. In addition, elemental energy spectra have now been measured over a significant fraction of two solar cycles, thereby enabling studies of the time dependence of the solar modulation of galactic cosmic rays.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Wiedenbeck, M. E.0000-0002-2825-3128
Binns, W. R.0000-0001-6110-3407
Israel, M. H.0000-0002-8104-208X
Leske, R. A.0000-0002-0156-2414
Christian, E. R.0000-0003-2134-3937
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
de Nolfo, G. A.0000-0002-3677-074X
Labrador, A. W.0000-0001-9178-5349
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-NoDerivatives 4.0 International License. We thank G. Morlino and V. Ptuskin for helpful comments on the application of propagation models to derive of the source ratio ^(60)Fe/^(56)Fe. The research was carried out with support from the National Aeronautics and Space Administration at the California Institute of Technology (under grant NNX13AH66G), the Jet Propulsion Laboratory, Washington University in St. Louis, and the Goddard Space Flight Center.
Group:Space Radiation Laboratory
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Series Name:Proceedings of Science
Issue or Number:301
Record Number:CaltechAUTHORS:20180828-122926410
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89247
Deposited By: George Porter
Deposited On:30 Aug 2018 20:36
Last Modified:16 Nov 2021 00:33

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