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Intensity Gradients of Anomalous Cosmic Rays Between 1 AU and Voyager During Solar Cycle 23

Leske, R. A. and Cummings, A. C. and Cohen, C. M. S. and Mewaldt, R. A. and Stone, E. C. and Wiedenbeck, M. E. and von Rosenvinge, T. T. (2005) Intensity Gradients of Anomalous Cosmic Rays Between 1 AU and Voyager During Solar Cycle 23. In: Proceedings of the 29th International Cosmic Ray Conference. Vol.2. Tata Institute of Fundamental Research , Mumbai, India, pp. 113-116.

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Using ACE/SIS data we obtain measurements of the variation of the anomalous cosmic ray (ACR) O intensity at 1 AU throughout the solar cycle, including periods near solar maximum. After being suppressed by a factor of ~100 or more from 2001 through 2003 during solar maximum, ACR intensities are once again recovering at 1 AU, but their intensities are lower relative to higher rigidity galactic cosmic rays (GCRs) than they were during entry into solar maximum in 1998-2000. Comparison of the 1 AU ACR and GCR time variations with those measured by both Voyager spacecraft in the outer heliosphere shows that both ACR and GCR large-scale radial gradients are greater at solar maximum than at solar minimum, and that the ACR radial gradients are much larger than those of the GCRs, becoming very large inside of ~5 AU.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Leske, R. A.0000-0002-0156-2414
Cummings, A. C.0000-0002-3840-7696
Cohen, C. M. S.0000-0002-0978-8127
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© 2005 Tata Institute of Fundamental Research. This work was supported by NASA at Caltech (under grants NAG5-6912 and NAS7-03001), JPL, and GSFC. We acknowledge the Ulysses Data System for COSPIN/LET data and the National Science Foundation (grant ATM-9912341) for Climax neutron monitor data.
Group:Space Radiation Laboratory
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Goddard Space Flight Center (GSFC)UNSPECIFIED
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Space Radiation Laboratory2005-23
Record Number:CaltechAUTHORS:20140903-072308449
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49164
Deposited By: Tony Diaz
Deposited On:05 Sep 2014 21:47
Last Modified:09 Mar 2020 13:19

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