Two-stream instability in collisionless shocks and foreshock

M.E. Dieckmann, Bengt Eliasson, Padma Shukla, N.J. Sircombe, R. O. Dendy

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Shocks play a key role in plasma thermalization and particle acceleration in the near Earth space plasma, in astrophysical plasma and in laser plasma interactions. An accurate understanding of the physics of plasma shocks is thus of immense importance. We give an overview over some recent developments in particle-in-cell simulations of plasma shocks and foreshock dynamics. We focus on ion reflection by shocks and on the two-stream instabilities these beams can drive, and these are placed in the context of experimental observations, e.g. by the Cluster mission. We discuss how we may expand the insight gained from the observation of proton beam driven instabilities at near Earth plasma shocks to better understand their astrophysical counterparts, such as ion beam instabilities triggered by internal and external shocks in the relativistic jets of gamma ray bursts, shocks in the accretion discs of micro-quasars and supernova remnant shocks. It is discussed how and why the peak energy that can be reached by particles that are accelerated by two-stream instabilities increases from keV energies to GeV energies and beyond, as we increase the streaming speed to relativistic values, and why the particle energy spectrum sometimes resembles power law distributions.
LanguageEnglish
PagesB303-B311
Number of pages9
JournalPlasma Physics and Controlled Fusion
Volume48
Issue number12B
DOIs
Publication statusPublished - 13 Nov 2006

Fingerprint

shock
Plasmas
Earth (planet)
Plasma interactions
astrophysics
Plasma stability
Cluster Mission
Proton beams
Gamma rays
laser plasma interactions
Ion beams
space plasmas
particle acceleration
supernova remnants
Physics
proton beams
particle energy
gamma ray bursts
accretion disks
quasars

Keywords

  • two-stream instability
  • collisionless shock

Cite this

Dieckmann, M.E. ; Eliasson, Bengt ; Shukla, Padma ; Sircombe, N.J. ; Dendy, R. O. / Two-stream instability in collisionless shocks and foreshock. In: Plasma Physics and Controlled Fusion. 2006 ; Vol. 48, No. 12B. pp. B303-B311.
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Two-stream instability in collisionless shocks and foreshock. / Dieckmann, M.E.; Eliasson, Bengt; Shukla, Padma; Sircombe, N.J.; Dendy, R. O.

In: Plasma Physics and Controlled Fusion, Vol. 48, No. 12B, 13.11.2006, p. B303-B311.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Two-stream instability in collisionless shocks and foreshock

AU - Dieckmann, M.E.

AU - Eliasson, Bengt

AU - Shukla, Padma

AU - Sircombe, N.J.

AU - Dendy, R. O.

PY - 2006/11/13

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AB - Shocks play a key role in plasma thermalization and particle acceleration in the near Earth space plasma, in astrophysical plasma and in laser plasma interactions. An accurate understanding of the physics of plasma shocks is thus of immense importance. We give an overview over some recent developments in particle-in-cell simulations of plasma shocks and foreshock dynamics. We focus on ion reflection by shocks and on the two-stream instabilities these beams can drive, and these are placed in the context of experimental observations, e.g. by the Cluster mission. We discuss how we may expand the insight gained from the observation of proton beam driven instabilities at near Earth plasma shocks to better understand their astrophysical counterparts, such as ion beam instabilities triggered by internal and external shocks in the relativistic jets of gamma ray bursts, shocks in the accretion discs of micro-quasars and supernova remnant shocks. It is discussed how and why the peak energy that can be reached by particles that are accelerated by two-stream instabilities increases from keV energies to GeV energies and beyond, as we increase the streaming speed to relativistic values, and why the particle energy spectrum sometimes resembles power law distributions.

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