Landau damping in space plasmas

Details Landau damping in space plasmas Landau damping in space plasmas

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phflb...3.2117t&link_type=abstract

Physics of Fluids B (ISSN 0899-8221), vol. 3, no. 8, pt. 1, Aug. 1991, p. 2117-2123.

Physics

68

Collisionless Plasmas, Electrostatic Waves, Landau Damping, Plasma Waves, Space Plasmas, Distribution Functions, Electron Plasma, Ion Acoustic Waves

Scientific paper

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 omega0 - (i)(gamma) have been obtained as a function of the normalized wave number (k)(lambdaD), where lambdaD 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.

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