Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe..18d&link_type=abstract
Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 10, 2006, Kavli Institute for Theoretical Physics,
Physics
Scientific paper
We discuss the diffusive acceleration mechanism in SNR shocks in terms ofits potential to accelerate CRs to 10(18) eV, as observations imply. Onepossibility, currently discussed in the literature, is to resonantlygenerate a turbulent magnetic field via accelerated particles in excess ofthe background field. We analyze some problemsof this scenario and suggest a different mechanism, which is based on thegeneration of Alfven waves at the gyroradius scale at thebackground field level, with a subsequent transfer to longer scales viainteraction with strong acoustic turbulence in the shock precursor. Theacoustic turbulence in turn, may be generated by Druryinstability or by parametric instability of the Alfven (A) waves. Theessential idea is an A→A+S decay instability process, where one of theinteracting scatterers (i.e. the sound, or S-waves) are driven by the Druryinstability process. This rapidly generates longer wavelength Alfvenwaves, which in turn resonate with high energy CRs thus binding them to theshock and enabling their furtheracceleration.
Diamond Patrick H.
Malkov M. A.
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