Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..556..331k&link_type=abstract
EXPLOSIVE PHENOMENA IN ASTROPHYSICAL COMPACT OBJECTS: First KIAS Astrophysics Workshop. AIP Conference Proceedings, Volume 556,
Astronomy and Astrophysics
Astrophysics
Cosmic Rays, Supernova Remnants
Scientific paper
We believe supernova remnants (SNRs) probably supply all but the highest energy cosmic rays (CRs) below the Ankle energy. Diffusive shock acceleration (DSA) is now widely accepted as the model to explain the production of CRs in a wide range of astrophysical environments. Owing to complex nonlinear physics involved in the model numerical simulations have been quite useful and successful in understanding the details of the acceleration process and dynamical feedback of the CRs to the underlying plasma. Despite the initial success of the theory in explaining the energetics and the spectrum of CRs accelerated by SNRs, there still remain some unresolved issues such as particle injection out of the thermal plasma at shocks, CR diffusion due to the self-generated MHD waves and yet-to-be-detected gamma-ray emission due to the ionic CRs. One of the greater technical difficulties in full DSA theory for SNRs comes from the likelihood that the CR scattering lengths range over several orders of magnitude from the thickness of the gas subshock to much greater scales. In order to overcome this numerical challenge, we have developed a novel computer code which uses multi-level adaptive mesh refinement and sub-zone shock tracking to provide enhanced spatial resolution around shocks at modest cost compared to the coarse grid and vastly improved cost effectiveness compared to a uniform, highly refined grid. .
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