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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. http://resolver.caltech.edu/CaltechAUTHORS:20150212-113747616

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Abstract

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
http://adsabs.harvard.edu/abs/1999ICRC....7..519CADSArticle
ORCID:
AuthorORCID
Cohen, C. M. S.0000-0002-0978-8127
Mason, G. M.0000-0003-2169-9618
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
Funders:
Funding AgencyGrant Number
NASANAS5-30704
NASANAG5-2963
NASANAS7-918
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1999-24
Record Number:CaltechAUTHORS:20150212-113747616
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150212-113747616
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54783
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:13 Feb 2015 19:47
Last Modified:13 Sep 2017 16:03

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