The morphology of anomalous cosmic rays in the outer heliosphere
C.D. Steenberg
California Institute of Technology, Pasadena, California, USA
A summary of the basic properties of the production and transport of
anomalous cosmic rays (ACRs) in the outer heliosphere is presented:
Acceleration by the solar wind termination shock (SWTS) determines the
energies where the modulated ACR peak intensities occur, including the
species scaling of the peak energies. ACR spectra at the SWTS are modified
by particle drifts, either hardening or softening the spectra, depending on
the latitude and heliospheric magnetic field polarity. Inside the shock,
ACRs are modulated in the same way as galactic cosmic rays (GCRs), except
that ionization of ACRs by solar wind protons determine the relative
abundances of the different ionization states of an ACR species.