Acceleration, Ionization, and Transport of Multiply Charged Anomalous Cosmic Rays: Interpretation of SAMPEX Observations
A.F. Barghouty1, J.R. Jokipii2, and R.A. Mewaldt1
1California Institute of Technology
2University of Arizona
Observations by SAMPEX have shown that the ionic charge state composition of anomalous cosmic rays (ACRs) is more complex than was previously realized. At energies <25 MeV/nucleon observed ACR N, O, and Ne are predominantly singly-charged, but at higher energies they are predominantly multiply charged. These observations place constraints on models for the acceleration of ACRs at the termination shock as well as their transport to 1 AU. We present new simulations of the acceleration, ionization, and transport of ACR elements He through Ar, taking advantage of new, theoretically-derived ionization cross sections. Comparisons to SAMPEX measurements and implications for models of ACR acceleration and transport will be presented.