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Observations of the Solar Modulation of Galactic and Anomalous Cosmic Rays During Solar Minimum

Christian, E. R. and Binns, W. R. and Blake, J. B. and Cohen, C. M. S. and Cummings, A. C. and Dwyer, J. R. and Hamilton, D. C. and Hill, M. E. and Hink, P. L. and Keppller, E. and Krimigis, S. M. and Leske, R. A. and Looper, M. D. and Marsden, R. G. and Mason, G. M. and Mazur, J. E. and Mewaldt, R. A. and Sanderson, T. R. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. and Yanasak, N. (1999) Observations of the Solar Modulation of Galactic and Anomalous Cosmic Rays During Solar Minimum. In: Proceedings of the 26th International Cosmic Ray Conference. Vol.7. International Union of Pure and Applied Physics , pp. 519-522.

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From the end of 1997 to early 1998, the relatively steady-state solar-minimum conditions provided an ideal period to study the solar modulation of anomalous cosmic rays (ACRs) and galactic cosmic rays (GCRs). Using observations of the energy spectra of the most abundant elements (H, He, C, N, 0, and Ne) from an array of spacecraft and instruments, we calculate the radial gradients for ACRs and GCRs over a wide range of rigidity. The GCR radial gradient is near zero for all rigidities, out to 70 AU. The ACR radial gradient shows a strong rigidity dependence in the middle heliosphere, which is expected, but the rigidity dependence is not present in the outer heliosphere, and is not obvious in the inner heliosphere.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Christian, E. R.0000-0003-2134-3937
Binns, W. R.0000-0001-6110-3407
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Hill, M. E.0000-0002-5674-4936
Krimigis, S. M.0000-0003-2781-2386
Leske, R. A.0000-0002-0156-2414
Mason, G. M.0000-0003-2169-9618
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© University of Utah. Provided by the NASA Astrophysics Data System. Some of this work is supported by NASA contracts NAS7-918 and NASS-30704 and NASA grants NAGS-6912 and NAGS-2963.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1999-24
Record Number:CaltechAUTHORS:20150212-113747616
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54783
Deposited By: Deborah Miles
Deposited On:13 Feb 2015 19:47
Last Modified:09 Mar 2020 13:19

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