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. https://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.
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| 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 | ||||||||||||||||||
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| Record Number: | CaltechAUTHORS:20150212-115444336 | ||||||||||||||||||
| Persistent URL: | https://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: | 09 Mar 2020 13:19 |
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