Shock Acceleration of Pickup Ions with a Field-Aligned Focused Transport Approach

Details Shock Acceleration of Pickup Ions with a Field-Aligned Focused Transport Approach Shock Acceleration of Pickup Ions with a Field-Aligned Focused Transport Approach

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh51a1194l&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH51A-1194

Physics

2104 Cosmic Rays, 2124 Heliopause And Solar Wind Termination, 2152 Pickup Ions

Scientific paper

Voyager 1 observations close to the termination shock show that ion distributions are highly anisotropic in the energy range of ~20 keV to ~20 MeV. These anisotropies, which are basically field-aligned, are too large for cosmic-ray diffusion theory to apply. Thus the formation of anomalous cosmic rays cannot be accurately modeled using standard cosmic-ray diffusion theory. To address this limitation, we are in the process of developing a model based on field-aligned focused transport and acceleration where there are no restrictions on particle pitch-angle anisotropy. As illustration of the feasibility of the model, we will show how a ring beam of interstellar pickup ions are accelerated to anomalous cosmic-ray energies at a strong shock as a function of upstream magnetic field obliquity. The role of magnetic mirroring or reflection of particles by the compression in the magnetic field across the shock and how this affects the slope of the accelerated spectrum at low energies will be investigated. Particle anisotropies at low energies will be discussed.

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