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Published 1999 | Published
Book Section - Chapter Open

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

Abstract

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.

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.

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