Connecting shock velocities to electron-injection mechanisms

M.E. Dieckmann, Bengt Eliasson, A. Stathopoulos, A. Ynnerman

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Electrons can be accelerated by their interaction with nonlinearly saturated electrostatic waves up to speeds with which they can undergo diffusive acceleration across supernova remnant shocks. Here, we model this wave-electron interaction by particle-in-cell and Vlasov simulations. We find that the lifetime of the saturated wave is considerably longer in the Vlasov simulation, due to differences in how these simulation methods approximate the plasma. Electron surfing acceleration which requires a stable saturated wave may thus be more important for electron acceleration at shocks than previously thought. For beam speeds above a critical value, which we estimate here, both simulation codes exclude surfing acceleration due to a rapid wave collapse.
LanguageEnglish
Article number065006
Number of pages4
JournalPhysical Review Letters
Volume92
Issue number6
DOIs
Publication statusPublished - 13 Feb 2004

Fingerprint

shock
injection
electron acceleration
electrons
simulation
electrostatic waves
supernova remnants
electron scattering
life (durability)
estimates
cells
interactions

Keywords

  • shocks
  • electron acceleration
  • Buneman instability

Cite this

Dieckmann, M.E. ; Eliasson, Bengt ; Stathopoulos, A. ; Ynnerman, A. / Connecting shock velocities to electron-injection mechanisms. In: Physical Review Letters. 2004 ; Vol. 92, No. 6.
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Connecting shock velocities to electron-injection mechanisms. / Dieckmann, M.E.; Eliasson, Bengt; Stathopoulos, A.; Ynnerman, A.

In: Physical Review Letters, Vol. 92, No. 6, 065006, 13.02.2004.

Research output: Contribution to journalArticle

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AU - Dieckmann, M.E.

AU - Eliasson, Bengt

AU - Stathopoulos, A.

AU - Ynnerman, A.

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AB - Electrons can be accelerated by their interaction with nonlinearly saturated electrostatic waves up to speeds with which they can undergo diffusive acceleration across supernova remnant shocks. Here, we model this wave-electron interaction by particle-in-cell and Vlasov simulations. We find that the lifetime of the saturated wave is considerably longer in the Vlasov simulation, due to differences in how these simulation methods approximate the plasma. Electron surfing acceleration which requires a stable saturated wave may thus be more important for electron acceleration at shocks than previously thought. For beam speeds above a critical value, which we estimate here, both simulation codes exclude surfing acceleration due to a rapid wave collapse.

KW - shocks

KW - electron acceleration

KW - Buneman instability

UR - http://prl.aps.org/abstract/PRL/v92/i6/e065006

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DO - 10.1103/PhysRevLett.92.065006

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