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Published August 1, 2000 | Published
Journal Article Open

Solar cycle dependence of the geomagnetically trapped anomalous cosmic rays


Solar cycle variations in the intensity of geomagnetically trapped anomalous cosmic ray (ACR) oxygen are demonstrated by ∼7 years of data from the SAMPEX satellite. They correspond to similar variations in the interplanetary ACR source. Trapped particle losses during the approach to solar maximum are not associated with geomagnetic activity and may be consistent with atmospheric energy degradation. The average trapped particle pitch angle distribution and energy spectra support this interpretation in which both source and loss rates are proportional to atmospheric density.

Additional Information

© 2000 American Geophysical Union. Received March 1, 2000; accepted April 13, 2000. This work was supported by NASA Cooperative Agreement 26979B with the Aerospace Corporation and by NASA grant NAS5-2963. The Climax neutron monitor is supported by National Science Foundation Grant ATM-9613963.

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