Particle acceleration by lower-hybrid turbulence

R. Bingham, J. M. Dawson, V. D. Shapiro

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We investigate particle acceleration by strong lower-hybrid turbulence produced by the relaxation of an energetic perpendicular ion ring distribution. Ion ring distributions are associated with counterstreaming plasma flows in a magnetic field, and are found at perpendicular shocks as a result of ion reflection from the shock surface. Using a 2½D particle-in-cell (PIC) code that is fully electromagnetic and relativistic, we show that the ion ring is unstable to the generation of strong plasma turbulence at the lower-hybrid resonant frequency. The lower-hybrid wave turbulence collapses in configuration space, producing density cavities. The collapse of the cavities is halted by particle acceleration, producing energetic electron and ion tails. For solar flare plasmas with temperatures of 1 keV and a ratio of the plasma frequency to the electron cyclotron frequency of ½, we demonstrate electron acceleration to energies up to MeV, while the ions are accelerated to energies in the region of several MeV.
LanguageEnglish
Pages161-172
Number of pages12
JournalJournal of Plasma Physics
Volume68
Issue number3
DOIs
Publication statusPublished - Apr 2002

Fingerprint

particle acceleration
turbulence
ions
rings
shock
plasma turbulence
cavities
electron acceleration
space density
cyclotron frequency
plasma frequencies
magnetohydrodynamic flow
solar flares
resonant frequencies
electrons
electromagnetism
energy
configurations
magnetic fields

Keywords

  • lower hybrid turbulence
  • ion ring
  • ion reflection
  • particle acceleration

Cite this

Bingham, R. ; Dawson, J. M. ; Shapiro, V. D. / Particle acceleration by lower-hybrid turbulence. In: Journal of Plasma Physics. 2002 ; Vol. 68, No. 3. pp. 161-172.
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Particle acceleration by lower-hybrid turbulence. / Bingham, R.; Dawson, J. M.; Shapiro, V. D.

In: Journal of Plasma Physics, Vol. 68, No. 3, 04.2002, p. 161-172.

Research output: Contribution to journalArticle

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AU - Bingham, R.

AU - Dawson, J. M.

AU - Shapiro, V. D.

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AB - We investigate particle acceleration by strong lower-hybrid turbulence produced by the relaxation of an energetic perpendicular ion ring distribution. Ion ring distributions are associated with counterstreaming plasma flows in a magnetic field, and are found at perpendicular shocks as a result of ion reflection from the shock surface. Using a 2½D particle-in-cell (PIC) code that is fully electromagnetic and relativistic, we show that the ion ring is unstable to the generation of strong plasma turbulence at the lower-hybrid resonant frequency. The lower-hybrid wave turbulence collapses in configuration space, producing density cavities. The collapse of the cavities is halted by particle acceleration, producing energetic electron and ion tails. For solar flare plasmas with temperatures of 1 keV and a ratio of the plasma frequency to the electron cyclotron frequency of ½, we demonstrate electron acceleration to energies up to MeV, while the ions are accelerated to energies in the region of several MeV.

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