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  • Other Sources  (12)
  • 1980-1984  (12)
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  • 1
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    Excitation of whistler waves by reflected auroral electrons (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Excitation of electron waves and whistlers by reflected auroral electrons which possess a loss-cone distribution is investigated. Based on a given magnetic field and density model, the instability problem is studied over a broad region along the auroral field lines. This region covers altitudes ranging from one quarter of an earth radius to five earth radii. It is found that the growth rate is significant only in the region of low altitude, say below the source region of the auroral kilometric radiation. In the high altitude region the instability is insignificant either because of low refractive indices or because of small loss cone angles.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science (ISSN 0032-0633); 31; May 1983
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    NASA TECHNICAL REPORTS
  • 2
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    The effect of space charge fields due to finite length electron beams in the free-electron laser (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The space charge electric field of a finite length electron beam in the free electron laser amplifier with a tapered wiggler is analyzed. In the free drift region between the accelerator and laser, expressions for the increase of energy spread due to the self field are presented. In the FEL interaction region, the general conditions on the importance of the self electric field in the equations of motion is obtained. A numerical example of the FEL experiment at 10.6 microns is given.
    Keywords: LASERS AND MASERS
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    NASA TECHNICAL REPORTS
  • 3
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    Modulational instability in a plasma with suprathermal electrons (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The consequences of the presence of suprathermal electrons on the linear stage of modulational instabilities are investigated for a range of parameters appropriate to both laboratory and astrophysical plasmas. Substantial modification to the growth rate and secondary spectrum are found to occur for instabilities driven by large amplitude Langmuir waves in the dipole limit due to the kinetic effects of the suprathermal electrons. In particular, for reasonable choices of pump amplitude and suprathermal energy density, additional modes become unstable.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids; 24; Mar. 198
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    NASA TECHNICAL REPORTS
  • 4
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    Radiation from a localized Langmuir oscillation in a uniformly magnetized plasma (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The electromagnetic radiation at the first and second harmonics of the electron plasma frequency from a localized Langmuir perturbation is computed for the case of a uniformly magnetized plasma. It is assumed that the localized perturbations in both the electrostatic field and plasma density have cylindrical symmetry about the direction of the ambient magnetic field. The analysis is initially performed for such an arbitrary localized perturbation, and then applied to treat the case of a quasi-planar Langmuir soliton propagating in the direction of the magnetic field. An extensive numerical study of the angular dependence of the radiation spectrum as a function of the ratio of the electron plasma and cyclotron frequencies is described.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids; 23; Aug. 198
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  • 5
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    Spontaneous emission of plasma-frequency radiation in tokamaks (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids; 23; Feb. 198
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  • 6
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    Wave excitation by inhomogeneous suprathermal electron beams (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Wave excitation by an inhomogeneous suprathermal electron beam in a homogeneous magnetized plasma is studied. Not only is the beam density nonuniform, but the beam electrons possess a sheared bulk velocity. The general dispersion equation encompassing both electrostatic and electromagnetic effects is derived. Particular attention is given to the whistler mode. It is established that the density-gradient and velocity-shear effects are important for waves with frequencies close to the lower-hybrid resonance frequency.
    Keywords: PLASMA PHYSICS
    Type: Journal of Plasma Physics; 27; Feb. 198
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  • 7
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    Calculation of the spontaneous cyclotron emissivity using the complete relativistic resonance condition (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: An expression for the spectral emissivity of spontaneous synchrotron radiation for a plasma which consists of both thermal and suprathermal electron components is derived using the complete relativistic cyclotron resonance condition. The expression is valid over all angles of propagation. The result is applied to the study of the emission of radiation from an energetic population of electrons with a loss-cone distribution in a relatively low-density plasma (i.e., the electron plasma frequency is less than the cyclotron frequency).
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids (ISSN 0031-9171); 27; 1396-140
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  • 8
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    An electron cyclotron maser instability for astrophysical plasmas (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The electron cyclotron maser instability is analyzed for a plasma which consists of a suprathermal electron component characterized by velocity-space anisotropies in directions both parallel and perpendicular to the ambient magnetic field, as well as a high-density thermal plasma in which omega sub e is approximately equal to Omega sub e (where omega sub e and Omega sub e are the electron plasma and cyclotron frequencies). The complete relativistic resonance condition is used and shown to result in a 'resonance ellipse' in momentum space. The instability is considered for both cold and warm suprathermal electron distributions, and for frequencies omega approximately equal to Omega sub e in the ordinary mode and omega approximately equal to 2(Omega sub e) in the fast extraordinary mode. It is shown that the growth rates are comparable for these harmonics over a wide range of parameters which, since they are escape modes of the plasma, can lead to comparable radiation intensities.
    Keywords: ASTROPHYSICS
    Type: Physics of Fluids (ISSN 0031-9171); 26; Aug. 198
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    NASA TECHNICAL REPORTS
  • 9
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    Spontaneous emission of radiation from localized Langmuir perturbation (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The radiation at the first and second harmonics of the electron plasma frequency from localized Langmuir oscillations is computed for a field-free plasma. The localized perturbations are assumed to have cylindrical symmetry about the direction of propagation of the localized perturbation. It is shown that when the wavelengths of the excited modes are much greater than the scale lengths of the Langmuir perturbation, a quadrupole radiation pattern is recovered for emission at twice the electron plasma frequency. An application to type III solar radio bursts is discussed briefly.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids; 23; Apr. 198
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    NASA TECHNICAL REPORTS
  • 10
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    Strongly turbulent stabilization of electron beam-plasma interactions (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The stabilization of electron beam interactions due to strongly turbulent nonlinearities is studied analytically and numerically for a wide range of plasma parameters. A fluid mode coupling code is described in which the effects of electron and ion Landau damping and linear growth due to the energetic electron beam are included in a phenomenological manner. Stabilization of the instability is found to occur when the amplitudes of the unstable modes exceed the threshold of the oscillating two-stream instability. The coordinate space structure of the turbulent spectrum which results clearly shows that soliton-like structures are formed by this process. Phenomenological models of both the initial stabilization and the asymptotic states are developed. Scaling laws between the beam-plasma growth rate and the fluctuations in the fields and plasma density are found in both cases, and shown to be in good agreement with the results of the simulation.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids; 23; Mar. 198
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