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Long-Term Temporal Behavior of Interplanetary and Trapped Anomalous Cosmic Rays

Leske, R. A. and Mewaldt, R. A. and Selesnick, R. S. and Cummings, A. C. and von Rosenvinge, T. T. and Stone, E. C. and Wiedenbeck, M. E. (1999) Long-Term Temporal Behavior of Interplanetary and Trapped Anomalous Cosmic Rays. In: Proceedings of the 26th International Cosmic Ray Conference. Vol.7. International Union of Pure and Applied Physics , pp. 516-518.

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New measurements of the long-term temporal history of anomalous cosmic rays (ACRs) at 1 AU are presented, based on data from SAMPEX and ACE. Over the period from 1992 to 1997 the interplanetary intensity of 8 to 27 MeV/nuc ACR oxygen increased by a factor of -5 as solar minimum approached. The intensity of ACR oxygen trapped in the Earth's magnetosphere showed a corresponding time history. Early in 1998 both the interplanetary and trapped intensities suddenly decreased with the onset of solar activity leading to the next solar maximum. We discuss the relation of the time-delay between changes in the interplanetary and trapped fluxes, possible solar/interplanetary causes of these changes, and the lifetime of trapped ACRs in Earth's magnetosphere.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:This work was supported by NASA under grants NAGS-2963 and NAGS-6912 at Caltech, and at the Jet Propulsion Laboratory and the Goddard Space Flight Center.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1999-23
Record Number:CaltechAUTHORS:20150212-105955417
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54781
Deposited By: Deborah Miles
Deposited On:13 Feb 2015 03:13
Last Modified:09 Mar 2020 13:19

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