Instabilities and induced scattering due to nonlinear Landau damping of longitudinal plasma waves in a magnetic field

M. Porkolab, Robert P. H. Chang

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The matrix elements for nonlinear wave-particle scattering (nonlinear Landau damping) are obtained in explicit form for electrostatic waves from the Vlasov-Maxwell equations. The waves are allowed to propagate at arbitrary angles to the magnetic field, and no restrictions are imposed upon the Larmor radius or the frequencies. In the case k ≫k , the symmetry relations for mode-mode coupling are demonstrated by appropriate manipulations of the matrix elements. This allows one to cast the nonlinear Landau damping coefficients in a particularly simple form. The conditions for explosive instabilities are obtained, and a possible stabilization mechanism for these instabilities is pointed out. In the limit of either perpendicular or parallel propagation to the magnetic field, a comparison is made with previous results. The nonlinear stability of two types of velocity anisotropy instabilities are examined. Explosive instabilities are found to exist both for Harris modes and upper hybrid loss-cone modes. In addition, recent experimental results on nonlinear decay (induced scattering) of waves are discussed in the light of the present theory.

Original languageEnglish
Pages (from-to)283-296
Number of pages14
JournalPhysics of Fluids
Volume15
Issue number2
Publication statusPublished - 1972

Fingerprint

Plasma waves
Landau damping
plasma waves
Damping
Scattering
Magnetic fields
scattering
magnetic fields
electrostatic waves
Larmor radius
Maxwell equations
matrices
Maxwell equation
coupled modes
Cones
casts
manipulators
Electrostatics
constrictions
cones

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Mechanics of Materials
  • Computational Mechanics
  • Fluid Flow and Transfer Processes

Cite this

Instabilities and induced scattering due to nonlinear Landau damping of longitudinal plasma waves in a magnetic field. / Porkolab, M.; Chang, Robert P. H.

In: Physics of Fluids, Vol. 15, No. 2, 1972, p. 283-296.

Research output: Contribution to journalArticle

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