TY  - JOUR
A1  - van Marle, Allard Jan
A1  - Bohdan, Artem
A1  - Morris, Paul J.
A1  - Pohl, Martin
A1  - Marcowith, Alexandre
T1  - Diffusive shock acceleration at oblique high mach number shocks
T2  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - The current paradigm of cosmic-ray (CR) origin states that the greater part of galactic CRs is produced by supernova remnants. The interaction of supernova ejecta with the interstellar medium after a supernova's explosions results in shocks responsible for CR acceleration via diffusive shock acceleration (DSA). We use particle-in-cell (PIC) simulations and a combined PIC-magnetohydrodynamic (PIC-MHD) technique to investigate whether DSA can occur in oblique high Mach number shocks. Using the PIC method, we follow the formation of the shock and determine the fraction of the particles that gets involved in DSA. With this result, we use PIC-MHD simulations to model the large-scale structure of the plasma and the magnetic field surrounding the shock and find out whether or not the reflected particles can generate upstream turbulence and trigger DSA. We find that the feasibility of this process in oblique shocks depends strongly on the Alfvenic Mach number, and the DSA process is more likely to be triggered at high Mach number shocks.
Y1  - 2022
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/63561
SN  - 1538-4357
VL  - 929
IS  - 1
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -