Large-scale turbulence, shocks, and charged-particle acceleration

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We discuss the physics of particle acceleration by shocks moving in turbulent astrophysical plasmas. We suggest that the observed lack of agreement of energetic particles and shock properties in the heliosphere is likely to be a result of fluctuations and turbulence in the upstream fluid. Shock acceleration takes time, so the observations of particles at any given point and time at a shock reflects some combination of the history prior to the time of observation. Further, since the particles are mobile, there is spatial averaging as well. It follows that the shock properties observed by a spacecraft should not correlate well with the accelerated particles. Additionally, the upstream turbulence, and in particular, the fluctuations in plasma density have a large effect on the downstream magnetic field. These effects may also help to understand the magnetic field observed by Voyager 1 in the heliosheath.

Original languageEnglish (US)
Title of host publicationTURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS
Subtitle of host publication6th Annual International Astrophysics Conference
Pages243-257
Number of pages15
DOIs
StatePublished - Nov 27 2007
EventTURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS: 6th Annual International Astrophysics Conference - Oahu, HI, United States
Duration: Mar 16 2007Mar 22 2007

Publication series

NameAIP Conference Proceedings
Volume932
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherTURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS: 6th Annual International Astrophysics Conference
CountryUnited States
CityOahu, HI
Period3/16/073/22/07

Keywords

  • Cosmic rays
  • Particle acceleration
  • Turbulence

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Giacalone, J., & Jokipii, J. R. (2007). Large-scale turbulence, shocks, and charged-particle acceleration. In TURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS: 6th Annual International Astrophysics Conference (pp. 243-257). (AIP Conference Proceedings; Vol. 932). https://doi.org/10.1063/1.2778971