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A Comparison of ACE/CRIS Measurements of Galactic Cosmic-Ray Abundances and Energy Spectra for Two Successive Solar Minima

Lave, K. A. and Binns, W. R. and Cummings, A. C. and de Nolfo, G. A. and Israel, M. H. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2009) A Comparison of ACE/CRIS Measurements of Galactic Cosmic-Ray Abundances and Energy Spectra for Two Successive Solar Minima. In: Proceedings of the 31st International Cosmic Ray Conference. High Energy Physics Department, University of Lodz , Lodz, Poland.

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Using current solar minimum measurements from the Cosmic Ray Isotope Spectrometer (CRIS) onboard the Advanced Composition Explorer (ACE), we report the observed elemental abundances and energy spectra for C, 0, Si, and Fe in the energy range of ~50-500 MeV/nucleon. These measurements are compared to prior CRIS observations for the 1997-98 solar minimum period, when the solar magnetic field was of the opposite polarity. By April 2009, the current solar minimum intensities for each of the four elements has surpassed the peak intensities observed during the previous solar minimum. We also examine the correlation of the galactic cosmicray intensities with the tilt angle of the heliospheric current sheet. These studies will be important for understanding solar modulation processes, such as changes in drift effects during a solar cycle.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Binns, W. R.0000-0001-6110-3407
Cummings, A. C.0000-0002-3840-7696
de Nolfo, G. A.0000-0002-3677-074X
Israel, M. H.0000-0002-8104-208X
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:Copyright University of Łódź. Department of High Energy Astrophysics, 2010. This research is supported by NASA at Caltech, WU, JPL, and GSFC under grant NNX08All1G. KL would also like to thank NASA for support under grant NNX07 AP22H.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Jet Propulsion Laboratory (JPL)UNSPECIFIED
Washington UniversityUNSPECIFIED
Goddard Space Flight CenterUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2009-08
Record Number:CaltechAUTHORS:20150506-152948443
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57298
Deposited By: Deborah Miles
Deposited On:20 May 2015 02:38
Last Modified:09 Mar 2020 13:19

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