J.R. Jokipii University of Arizona, Tucson, Arizona, USA
The anomalous cosmic rays are of interest intrinsically, as a probe of heliospheric structure, and as a relatively nearby laboratory for the study of cosmic-ray acceleration. They are the result of a rather complicated series of processes occuring in the heliosphere, ranging from ionization and convection with the solar wind to acceleration and subsequent propagation throughout the heliosphere.
The resulting time variations, spatial extent, energy spectrum, charge state and composition all provide information about the physics involved, as well as about the original composition and nature of the accelerated particles.
The fundamental physics underlying this will be examined within the paradigm of acceleration of pickup ions, mainly at the solar-wind termination shock. Emphasis will be placed on the effects of the various processes on the composition and charge state of the observed particles.