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

Lavé, J. 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 Measurements of Galactic Cosmic-Ray Abundances and Energy Spectra for Two Successive Solar Minima. In: Proceedings of the 31st International Cosmic Ray Conference. , 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, O, Si, and Fe in the energy range of ~50-500MeV/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 cosmic ray 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 NNX08AI11G. KL would also like to thank NASA for support under grant NNX07AP22H.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2009-24
Record Number:CaltechAUTHORS:20150528-144715835
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57884
Deposited By: Deborah Miles
Deposited On:01 Jun 2015 23:35
Last Modified:09 Mar 2020 13:19

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