English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The highly amplified magnetic fields suggested by observations of somesupernova remnant (SNR) shells are most likely an intrinsic part of efficientparticle acceleration by shocks. This strong turbulence, which may result fromcosmic ray driven instabilities, both resonant and non-resonant, in the shockprecursor, is certain to play a critical role in self-consistent, nonlinearmodels of strong, cosmic ray modified shocks. Here we present a Monte Carlomodel of nonlinear diffusive shock acceleration (DSA) accounting for magneticfield amplification through resonant instabilities induced by acceleratedparticles, and including the effects of dissipation of turbulence upstream of ashock and the subsequent precursor plasma heating. Feedback effects between theplasma heating due to turbulence dissipation and particle injection are strong,adding to the nonlinear nature of efficient DSA. Describing the turbulencedamping in a parameterized way, we reach two important results: first, forconditions typical of supernova remnant shocks, even a small amount ofdissipated turbulence energy (~10%) is sufficient to significantly heat theprecursor plasma, and second, the heating upstream of the shock leads to anincrease in the injection of thermal particles at the subshock by a factor ofseveral. In our results, the response of the non-linear shock structure to theboost in particle injection prevented the efficiency of particle accelerationand magnetic field amplification from increasing. We argue, however, that moreadvanced (possibly, non-resonant) models of turbulence generation anddissipation may lead to a scenario in which particle injection boost due toturbulence dissipation results in more efficient acceleration and even strongeramplified magnetic fields than without the dissipation.

Turbulence Dissipation and Particle Injection in Non-Linear Diffusive Shock Acceleration with Magnetic Field Amplification