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  • 1
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    On self-consistent waves and their stability in warm plasmas. II - Instability of circularly polarized waves both in the presence and the absence of an ambient magnetic field (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The stability of a self-consistent, large-amplitude, circularly polarized wave in a warm plasma is investigated. For perturbations to the system propagating normal to the plane of circular polarization, a dispersion relation is derived employing an expansion in the nonlinear wave amplitude and the momentum of the plasma particles in the plane of polarization. Instability results both in the absence and presence of a large-scale magnetic field with a growth rate of the order of the nonlinear wave amplitude.
    Keywords: PLASMA PHYSICS
    Type: Journal of Plasma Physics; 24; Aug. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    On the stability of self-consistent large amplitude waves in a cold plasma. I - Transverse circularly polarized waves in the absence of a large scale magnetic field (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: It is demonstrated that a self-consistent circularly polarized wave in an otherwise field-free homogeneous cold plasma is unstable to small amplitude perturbations. For either an electron-positron plasma or an electron-proton plasma the instability rate is at least about the order of the effective plasma frequency when the bulk flow speed is zero. For finite bulk flow speeds of the plasma, it is shown that the electron-positron plasma is unstable, again with a growth rate of the order of the effective plasma frequency; it is also shown that the electron-proton plasma is unstable (at least at small wave numbers, k) with a growth rate proportional to k. The calculated instability rates are conservative, for other modes not investigated here may be more unstable. The results of these calculations bear directly on the understanding of plasma systems thought to be driven by large amplitude waves.
    Keywords: PLASMA PHYSICS
    Type: Journal of Plasma Physics; 20; Dec. 197
    Format: text
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  • 3
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    On self-consistent waves and their stability in warm plasma. I - Construction of the self-consistent waves (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Clemmow's (1974) work is extended to include the case of large-amplitude self-consistent waves in warm plasmas both with and without a constant embedded magnetic field. Attention is given to determining the structure and basic properties of large-amplitude self-consistent waves in a warm plasma in the presence of a constant embedded magnetic field. It is shown that the class of large-amplitude self-consistent waves found by Clemmow for a cold plasma can be extended to allow for a thermal spread in the particles' motions. Some of the interesting variations and dependences of such waves with a constant embedded magnetic field are emphasized.
    Keywords: PLASMA PHYSICS
    Type: Journal of Plasma Physics; 21; Feb. 197
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  • 4
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    On the stability of self-consistent large-amplitude waves in a cold plasma. II - Longitudinal waves in the absence of a large-scale magnetic field (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PLASMA PHYSICS
    Type: Journal of Plasma Physics; 21; Feb. 197
    Format: text
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  • 5
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    On phase and ray directions of magnetosonic waves (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The behavior of phase speed for 'slow' and 'fast' magnetosonic waves is well documented in the literature. Not so well documented is the behavior of the ray direction and its relation to the phase direction - indeed the ray behavior recorded in most of the standard plasma physics texts has not been found. This situation is rectified, and some of the curiosities associated with the direction of the 'slow' ray relative to the direction of the 'slow' phase wave are indicated. These calculations have been performed as a necessary basis for discussion of phase and ray evolution of magnetosonic waves in differentially shearing plasmas.
    Keywords: PLASMA PHYSICS
    Type: Astrophysics and Space Science; 57; 1, Au; Aug. 197
    Format: text
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