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Title: Particle acceleration at a turbulent shock

Abstract

Cosmic rays can be accelerated so efficiently at shock waves by the first-order Fermi mechanism that their pressure can be comparable to or exceed that of the thermal gas. Consequently, it was recognized that CRs could modify the structure of the shock itself, typically broadening it by the CR diffusive length scale. Besides modifying the accelerated particle spectrum, the CR pressure gradient across the shock can destabilize short-wavelength compressive fluctuations (such as acoustic waves), leading to a highly turbulent shock structure. In this paper, we investigate particle acceleration at a turbulence modified shock. We show that the presence of the turbulence can be treated as an effective diffusion coefficient, an effective flow speed and an effective second order Fermi diffusion.

Authors:
; ; ; ;  [1]
  1. IGPP, University of California, Riverside, CA 92521 (United States)
Publication Date:
OSTI Identifier:
20633027
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 719; Journal Issue: 1; Conference: 3. international IGPP conference on physics of the outer heliosphere, Riverside, CA (United States), 8-13 Feb 2004; Other Information: DOI: 10.1063/1.1809539; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCELERATION; COSMIC RADIATION; DIFFUSION; ENERGY SPECTRA; FLUCTUATIONS; PLASMA; PRESSURE GRADIENTS; SHOCK WAVES; SOUND WAVES; TURBULENCE; WAVELENGTHS

Citation Formats

Li, G, Zank, G P, Le Roux, J A, Webb, G M, and Axford, W I. Particle acceleration at a turbulent shock. United States: N. p., 2004. Web. doi:10.1063/1.1809539.
Li, G, Zank, G P, Le Roux, J A, Webb, G M, & Axford, W I. Particle acceleration at a turbulent shock. United States. https://doi.org/10.1063/1.1809539
Li, G, Zank, G P, Le Roux, J A, Webb, G M, and Axford, W I. 2004. "Particle acceleration at a turbulent shock". United States. https://doi.org/10.1063/1.1809539.
@article{osti_20633027,
title = {Particle acceleration at a turbulent shock},
author = {Li, G and Zank, G P and Le Roux, J A and Webb, G M and Axford, W I},
abstractNote = {Cosmic rays can be accelerated so efficiently at shock waves by the first-order Fermi mechanism that their pressure can be comparable to or exceed that of the thermal gas. Consequently, it was recognized that CRs could modify the structure of the shock itself, typically broadening it by the CR diffusive length scale. Besides modifying the accelerated particle spectrum, the CR pressure gradient across the shock can destabilize short-wavelength compressive fluctuations (such as acoustic waves), leading to a highly turbulent shock structure. In this paper, we investigate particle acceleration at a turbulence modified shock. We show that the presence of the turbulence can be treated as an effective diffusion coefficient, an effective flow speed and an effective second order Fermi diffusion.},
doi = {10.1063/1.1809539},
url = {https://www.osti.gov/biblio/20633027}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 719,
place = {United States},
year = {Wed Sep 15 00:00:00 EDT 2004},
month = {Wed Sep 15 00:00:00 EDT 2004}
}