Turbulence transmission in parallel relativistic shocks using ray tracing

J. Tammi*, R. Vainio

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We apply a semi-classical approach of handling waves as quasiparticle gas in a slowly varying flow - analogous to ray tracing - to calculate the Alfven wave transmission parameters, the resulting cross-helicity of the waves and the scattering-centre compression ratio, for cases where the shock thickness is large enough for the turbulent waves in the plasma to see the transition of the background flow parameters as smooth and slowly varying. For nonrelativistic shocks the wave transmission produces similar effects on the downstream turbulence and the scattering-centre compression ratio as does the transmission through a step shock: the downstream Alfven waves propagate predominantly towards the shock in the local plasma frame and, thus, the scattering-centre compression ratio is larger than the gas compression ratio. For thick relativistic shocks, however, we find qualitative differences with respect to the step-shock case: for low-Alfvenic-Mach-number shocks the downstream waves propagate predominantly away from the shock, and the scattering-centre compression ratio is lower than that of the gas. Thus, when taken into account, the Alfven wave transmission can decrease the efficiency of the first-order Fermi acceleration in a thick relativistic shock.

Original languageEnglish
Pages (from-to)23-28
Number of pages6
JournalAstronomy and Astrophysics
Volume460
Issue number1
DOIs
Publication statusPublished - Dec 2006
MoE publication typeA1 Journal article-refereed

Keywords

  • turbulence
  • shock waves
  • waves
  • ALFVEN-WAVE TRANSMISSION
  • TEST-PARTICLE ACCELERATION
  • FRONTS

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