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Time Variations of Galactic Comic Ray Intensities Near Earth: 1997 to 1999

Wiedenbeck, M. E. and Binns, W. R. and Christian, E. R. and Cohen, C. M. S. and Cummings, A. C. and George, J. S. and Hink, P. L. and Klarmann, J. and Leske, R. A. and Lijowski, M. and Mewaldt, R. A. and Slocum, P. L. and Stone, E. C. and von Rosenvinge, T. T. and Yanasak, N. E. (1999) Time Variations of Galactic Comic Ray Intensities Near Earth: 1997 to 1999. In: Proceedings of the 26th International Cosmic Ray Conference. Vol.7. International Union of Pure and Applied Physics , pp. 70-73. http://resolver.caltech.edu/CaltechAUTHORS:20150212-115444336

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Abstract

The time dependences of the intensities of low-energy galactic cosmic ray (GCR) nuclei have been investigated using instrumentation carried aboard the Advanced Composition Explorer (ACE). The intensities of these low energy particles near Earth began to decline from solar minimum levels in late-1997 /early-1998, shortly after the launch of ACE, and have been continuously monitored by the Cosmic Ray Isotope Spectrometer (CRIS) instrument since that time. We find that the variations are well correlated with variations of higher energy cosmic rays, as indicated by neutron monitor observations. The relative magnitude of the GCR variations is significantly less than previously reported for anomalous cosmic rays. We also compare the fluctuations observed for different energies and different nuclides.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://adsabs.harvard.edu/full/1999ICRC....7..508WADSArticle
ORCID:
AuthorORCID
Cohen, C. M. S.0000-0002-0978-8127
Additional Information:© University of Utah. Provided by the NASA Astrophysics Data System. This research was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, the Goddard Space Flight Center, and Washington University. Neutron monitor data were provided by the University of Chicago with support from NSF grant ATM-9613963.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NSFATM-9613963
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1999-25
Record Number:CaltechAUTHORS:20150212-115444336
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150212-115444336
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54784
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:13 Feb 2015 19:53
Last Modified:13 Sep 2017 16:04

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