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.