Langmuir wave

Langmuir wave

[′laŋ‚myu̇r ‚wāv]
(plasma physics)
A longitudinal, electrostatic wave that propagates in a plasma, because of variations in the plasma's electron density.
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References in periodicals archive ?
Looking in turn at non-turbulent plasmas and plasmas containing oscillatory electric fields, he covers electron density, temperature, magnetic field, effective charge of ions, low-frequency electrostatic turbulence, principles of spectroscopic diagnostics of plasmas containing quasi-monochromatic electric fields, Langmuir waves, and transverse microwave, laser, and/or laser-induced fields.
The model leads to two equations: one of these describes the evolution of the envelope of the Langmuir waves with the nonlinearity included through a term involving a density fluctuation, and the other describes the evolution of the density fluctuation due to the ponderomotive force exerted by the Langmuir waves.
When [a.sub.2] = [a.sub.3] = 0, (1) reduce to the famous Zakharov equations (see [18,19] for details) which describe the propagation of Langmuir waves in plasmas.