Time Variations of Anomalous Cosmic Rays at 1 AU with Increasing Solar Modulation

Details Time Variations of Anomalous Cosmic Rays at 1 AU with Increasing Solar Modulation Time Variations of Anomalous Cosmic Rays at 1 AU with Increasing Solar Modulation

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh22f07s&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH22F-07

Physics

2104 Cosmic Rays

Scientific paper

Anomalous Cosmic Rays (ACRs) are accelerated far out in the heliosphere at the termination shock. As they diffuse back through the solar system to 1 AU, they have been modulated in intensity. Over the course of the ACE mission, the intensity of ACRs at 1 AU has been decreasing as solar activity has been increasing. Oxygen at 7.1-10 MeV/nuc has decreased by a factor of about 80. Nitrogen and neon at similar energies have also had similar large decreases. We compare the changing fluxes of various ACR species with galactic cosmic rays at similar energies, and with higher energy results from the Climax Neutron Monitor. ACR oxygen, in particular, may no longer be observable in 2001 at 1 AU above the background of solar, interplanetary, and galactic cosmic ray particles. This work was supported by NASA under grant NAG5-6012.

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