Landau damping in space plasmas

The Landau damping of electrostatic Langmuir waves and ion-acoustic waves in a hot, isotropic, nonmagnetized, generalized Lorentzian plasma is analyzed using the modified plasma dispersion function. Numerical solutions for the real and imaginary parts of the wave frequency omega sub 0 - (i)(gamma) h...

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Bibliographic Details
Published in:Physics of fluids. B, Plasma physics Plasma physics, 1991-08, Vol.3 (8 pt), p.2117-2123
Main Authors: Thorne, Richard M., Summers, Danny
Format: Article
Language:English
Subjects:
640201 - Atmospheric Physics- Auroral, Ionospheric, & Magetospheric Phenomena
Astronomy
Astrophysics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DAMPING
DISPERSION RELATIONS
DISTRIBUTION FUNCTIONS
Earth, ocean, space
Exact sciences and technology
FLUIDS
FULLY IONIZED GASES
FUNCTIONS
Fundamental aspects of astrophysics
Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations
GASES
HOT PLASMA
ION ACOUSTIC WAVES
ION WAVES
IONIZED GASES
ISOTROPY
LANDAU DAMPING
LORENTZ GAS
Magnetohydrodynamics and plasmas
MODIFICATIONS
PLASMA
PLASMA WAVES
SPACE
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Summary:The Landau damping of electrostatic Langmuir waves and ion-acoustic waves in a hot, isotropic, nonmagnetized, generalized Lorentzian plasma is analyzed using the modified plasma dispersion function. Numerical solutions for the real and imaginary parts of the wave frequency omega sub 0 - (i)(gamma) have been obtained as a function of the normalized wave number (k)(lambda sub D), where lambda sub D is the electron Debye length. For both particle distributions the electrostatic modes are found to be strongly damped at short wavelengths. At long wavelengths, this damping becomes less severe, but the attenuation of Langmuir waves is much stronger for a generalized Lorentzian plasma than for a Maxwellian plasma. It is concluded that Landau damping of ion-acoustic waves is only slightly affected by the presence of a high energy tail, but is strongly dependent on the ion temperature.
ISSN:0899-8221
2163-503X
DOI:10.1063/1.859624