A Caltech Library Service

Observations of Anomalous Cosmic Rays at 1 AU

Leske, R. A. and Mewaldt, R. A. and Christian, E. R. and Cohen, C. M. S. and Cummings, A. C. and Slocum, P. L. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2000) Observations of Anomalous Cosmic Rays at 1 AU. In: Acceleration and Transport of Energetic Particles Observed in the Heliosphere. AIP Conference Proceedings. No.528. American Institute of Physics , Melville, N.Y. , pp. 293-300. ISBN 1-56396-951-3.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Anomalous cosmic rays (ACRs) provide a sensitive probe of the access of energetic particles to the inner heliosphere, varying in intensity by more than two orders of magnitude during the course of the solar cycle. New data which are becoming available from the Advanced Composition Explorer (ACE) can provide a detailed record of ACR intensity and spectral changes on short (~ 1 day) time scales during the approach to solar maximum, which will help address issues of ACR modulation and transport. The elemental and isotopic composition of ACRs provides important information on the source or sources of these particles, while their ionic charge state composition and its energy dependence serves as a diagnostic of their acceleration time scale. We review measurements of the ACR elemental, isotopic, and charge state composition and spectra as determined at 1 AU by SAMPEX, ACE, Wind, and other spacecraft. These results are important input to models of the acceleration, modulation, and transport of ACRs.

Item Type:Book Section
Related URLs:
URLURL TypeDescription DOIArticle
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Christian, E. R.0000-0003-2134-3937
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© 2000 American Institute of Physics. Issue Date: 15 September 2000. This research was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center. We thank R. S. Selesnick, N. E. Yanasak, and B. Klecker for providing data used in some of the figures. Climax neutron monitor data were obtained from the web, courtesy of the University of Chicago, National Science Foundation grant ATM-9613963.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Goddard Space Flight CenterUNSPECIFIED
Subject Keywords:primary cosmic rays, interstellar matter, cosmic ray origin, cosmic ray variations, solar activity, cosmic ray composition, element relative abundance, isotope relative abundance, cosmic ray energy spectra, transport processes, acceleration
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2000-25
Series Name:AIP Conference Proceedings
Issue or Number:528
Classification Code:PACS: 98.70.Sa; 96.40.De
Record Number:CaltechAUTHORS:20111208-100352581
Persistent URL:
Official Citation:Observations of anomalous cosmic rays at 1 AU R. A. Leske, R. A. Mewaldt, E. R. Christian, C. M. S. Cohen, A. C. Cummings, P. L. Slocum, E. C. Stone, T. T. von Rosenvinge, and M. E. Wiedenbeck, AIP Conf. Proc. 528, 293 (2000), DOI:10.1063/1.1324328
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28370
Deposited By: Ruth Sustaita
Deposited On:08 Dec 2011 19:46
Last Modified:09 Nov 2021 16:56

Repository Staff Only: item control page