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IEEE Transactions on Plasma Science

Issue 6 • Dec 1992

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Displaying Results 1 - 25 of 67
  • On finite ion Larmor radius MHD equations

    Publication Year: 1992, Page(s):1023 - 1025
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The finite ion Larmor radius effects in magnetohydrodynamic equations are formulated without imposing plasma incompressibility. The result is in agreement with the gyrokinetic formulation View full abstract»

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  • Effects of higher order nonlinearity on the propagation of solitary waves in relativistic ion drift plasma

    Publication Year: 1992, Page(s):1015 - 1022
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The effects of higher-order nonlinearity, relativistically drifting ions, and negative ions on the ion-acoustic solitons in a plasma having isothermal electrons are investigated theoretically. By applying the reductive perturbation technique to the basic system of equations, a modified Korteweg-de Vries equations and a linear inhomogeneous wave equation have been derived. Moreover, stationary solu... View full abstract»

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  • Three fluid transport models by particle-in-cell method for RF glow discharges

    Publication Year: 1992, Page(s):1000 - 1014
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    Three self-consistent fluid transport models, simulated by the particle-in-cell simulation method (PIC/FE), have been developed for parallel-plate RF glow discharges. The electron transport is modeled by the equilibrium single-moment and nonequilibrium two- and three-moment fluid equations. In the equilibrium single-moment model, the α and γ discharges are underestimated and the nonloc... View full abstract»

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  • Equilibrium of intergalactic currents

    Publication Year: 1992, Page(s):891 - 892
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    The plasma Universe approach to the structure of the Universe considers space to be filled with a network of currents which can undergo pinch compression. The equilibrium structures of such currents are treated in the same way as the structure in laboratory pinches. The difference, for the galactic case, is that gravitational interaction forces between the particles must be included in the analysi... View full abstract»

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  • Second-harmonic generation of laser radiation in a plasma with a density ripple

    Publication Year: 1992, Page(s):996 - 999
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    High-power laser radiation with frequency ω1 and wave vector k1zˆ propagating through a plasma at an angle to a density ripple (0,k&oarr;0) produces current and density perturbation at (ω1,k &oarr;1+k&oarr;0). The density perturbation couples with the oscillatory velocity... View full abstract»

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  • Force-free magnetic filaments and the cosmic background radiation

    Publication Year: 1992, Page(s):935 - 938
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Dense, force-free magnetic filaments generated by quasars, active galactic nuclei, and Herbig-Haro objects can remain stable in the intergalactic medium for many Gy. They will be opaque to radiation with wavelengths longer than 100-400 μm, and essentially transparent to shorter wavelengths. They are thus capable of thermalizing and isotropizing the cosmic background radiation, and of accounting... View full abstract»

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  • Development of strongly dissipative MHD structures

    Publication Year: 1992, Page(s):882 - 890
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The formation of compact magnetic structures by advection of an initial magnetic seed due to the motion of the plasma, and the intensification of the field due to line stretching are discussed. It is shown that when the plasma is squeezed locally by external agents, so that an inflow-outflow near a stagnation point is generated by the pinching, large amounts of Joule heating are obtained in a shor... View full abstract»

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  • Plasma diffusion through multidipole magnetic fields

    Publication Year: 1992, Page(s):988 - 995
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The diffusion of a cold plasma through multidipole fields of a magnetic picket fence is presented. The ion diffusion and trapping are determined by electric potentials inside the multidipole fields. The electron diffusion is regulated by an anomalous transport process driven by low-frequency fluctuations inside the magnetic sheath. Particles drifting with velocities above the ion acoustic speed ge... View full abstract»

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  • Some aspects of dust-plasma interactions in the cosmic environment

    Publication Year: 1992, Page(s):929 - 934
    Cited by:  Papers (93)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    A brief, critical review of dust-plasma interactions in the cosmic environment is presented, with emphasis on certain results. Both single-particle (e.g., gravitoelectrodynamics) and collective (e.g., appearance of new wave models) effects are discussed and some areas in which further research is needed are pointed out. The pressing need for laboratory studies, both to provide the necessary data f... View full abstract»

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  • Electrodynamic forces in stellar formation

    Publication Year: 1992, Page(s):877 - 881
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The role of electrodynamic forces in star formation is discussed. Magnetic flux and angular momentum problems in star formation are discussed. It can be shown that ambipolar diffusion is able to solve the magnetic flux problem. It is also shown that Alfven waves create a Lorentz force on the plasma. Rotation of the contracting protostar creates torsional Alfven waves. The created Lorentz force can... View full abstract»

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  • The electrical simulation of a gas discharge excited copper laser

    Publication Year: 1992, Page(s):979 - 987
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    A circuit model of a gas laser discharge is described for use with simulator packages such as SPICE to describe the behavior of the combined circuit representing a copper vapor laser with its modulator drive. The study treats the laser tube and discharge combination as a transmission line with time-varying impedance elements for which the time variation is achieved by the introduction of controlle... View full abstract»

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  • Alfven's programme in solar system physics

    Publication Year: 1992, Page(s):577 - 589
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1448 KB)

    Hannes Alfven's research program in solar system physics provides a valuable case study for the historians and philosophers of science. The response of the scientific community to his remarkable contributions is a severe test of widely held views about how science is or should be done. Seven of those contributions are examined, in the light of two doctrines of scientific methodology, those of Karl... View full abstract»

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  • Electrostatic ion-cyclotron wave experiments in the WVU Q machine

    Publication Year: 1992, Page(s):631 - 635
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    The influence of transverse, localized, DC electric fields (TLEs) on the current-driven electrostatic ion-cyclotron (CDEIC) instability is being investigated in a Q machine. A small (diameter ~10 ion gyroradii) segmented disk electrode is being used to excite the mode in a narrow electron-current channel along which exists a radial electric field between regions that magnetically map to the differ... View full abstract»

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  • Wave-particle interaction at the plasmasphere-ring current interface

    Publication Year: 1992, Page(s):829 - 832
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    During the plasmasphere filling process following geomagnetic storms, an outward density decrease of the cold plasma at L=3-4 is typically observed. When this structure overlaps with the sharp inner edge of the ring current, wave activity is detected at linearly stable phase velocities. The excitation of these waves around the lower hybrid frequency and their effects on the heating of the... View full abstract»

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  • Two-stream and gravitational instabilities in a grain plasma

    Publication Year: 1992, Page(s):922 - 928
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    If the massive component of a two-component plasma consists of weakly charged solid grains, electrostatic and gravitational instabilities can operate on similar spatial and temporal scales. In particular, when the grain charge-to-mass ratio is on the order of the square root of the gravitational constant, the electrostatic two-stream (or Buneman) instability can seed the Jeans gravitational instab... View full abstract»

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  • The high-current-density phase of the discharge in low-pressure high-power switches as a mode of the vacuum discharge

    Publication Year: 1992, Page(s):1047 - 1052
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Concepts of the theory of near-cathode layers of vacuum arcs are extended to the range of lower values of the current density and of the temperature of the cathode surface. It is shown that these concepts describe the mode of the vacuum discharge with the near-cathode voltage drop on the level of several hundred volts. The main features of this mode correspond qualitatively to those of the high-cu... View full abstract»

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  • Current loop models for the circumstellar matter in SN 1987A

    Publication Year: 1992, Page(s):874 - 876
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    Some properties of current-loop models are explored, and some implications are discussed. The elliptical ring observed to be centered on the supernova can be interpreted as light from ions trapped in the magnetic field of a circular current loop. The current is 1.5×10 12 A for a model where gravitational force on 0.03 solar masses of trapped matter balances the electrodynamic expa... View full abstract»

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  • Observations of weak double layers on auroral field lines

    Publication Year: 1992, Page(s):756 - 763
    Cited by:  Papers (117)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    The wave instrument on the Swedish Viking satellite performed measurements of plasma density and potential fluctuations with high temporal and spatial resolution. In the auroral regions, double-layer structures were observed which have scale lengths of about 100 m and where the plasma density is reduced by up to 50%. The structures are negatively charged and have net potential drops of up to a few... View full abstract»

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  • Excitation of hybrid electrostatic-electromagnetic modes in a plasma-loaded sheath helix

    Publication Year: 1992, Page(s):973 - 978
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A plasma-loaded sheath helix supports lower hybrid modes that extended to the outside vacuum region. The phase velocity of the mode is significantly retarded by the presence of the sheath helix, making it liable to excitation by a low-energy electron beam. The extent of the mode outside the plasma is also reduced by the helix. An analysis of lower hybrid mode excitation by a beam propagating in th... View full abstract»

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  • Magnetopause plasma transients: mapping into the auroral ionosphere

    Publication Year: 1992, Page(s):715 - 725
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1020 KB)

    Attention is focused on a specific category of auroral event occurring predominantly during a southward directed interplanetary magnetic field (IMF). Coordinated observations from the ground and satellites in polar orbit have been used to study the temporal/spatial development of the events in relation to the background patterns of particle precipitation and ionospheric convection as well as the f... View full abstract»

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  • Internal dynamics of a plasma propelled across a magnetic field

    Publication Year: 1992, Page(s):672 - 677
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    When a plasma is pushed across a magnetic field by some nonelectromagnetic force, ions and electrons get turned in opposite directions by the magnetic field. This creates an internal current as well as sheaths at the plasma surfaces and results in an electric field which allows the plasma to maintain some, or even most of its initial momentum in the form of E&oarr;×B&oarr; ... View full abstract»

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  • Unification of gravity and electromagnetism in the plasma universe

    Publication Year: 1992, Page(s):944 - 957
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1304 KB)

    The basic arguments and results of the gravity-electromagnetism (GEM) theory are presented. This theory unifies gravity and electromagnetism using simple models and concepts and is based on two postulates: (1) gravity is a spatially varying Poynting field that defines the geometry of space such that ultrastrong fields are self-canceling and (2) the splitting or separation of characteristics of gra... View full abstract»

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  • Double-layer-relevant laboratory results

    Publication Year: 1992, Page(s):601 - 606
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    Many double-layer-relevant laboratory experiments have been carried out at the University of Wisconsin. Laboratory stair-step double layers, which resemble three or more weak double layers joined in series, have been produced without ionization. Double-layer floating potential fluctuations have been investigated and progress has been made in developing a novel technique for measuring electron ener... View full abstract»

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  • Inequality conditions for critical velocity ionization space experiments

    Publication Year: 1992, Page(s):770 - 777
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    A compilation is given of various parametric conditions for the critical ionization velocity (CIV) process to occur in the ionosphere. The most important and salient aspects of CIV are discussed, including beam velocity, Townsend's criterion, magnetic-field strength, beam width, pitch angle, mixture of species, metastable states, and mass loading View full abstract»

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  • Low-dimensional behavior and symmetry breaking of stochastic systems near criticality-can these effects be observed in space and in the laboratory?

    Publication Year: 1992, Page(s):691 - 694
    Cited by:  Papers (98)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    It is demonstrated that nonlinear stochastic systems near criticality (including self-organized criticality) will generally exhibit low-dimensional behavior. A connection is given between the fractal dimensions of finite-dimensional chaotic systems and the anomalous dimensions in stochastic systems near criticality. The effect of additional random noise on stochastic systems will be delineated in ... View full abstract»

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Aims & Scope

IEEE Transactions on Plasma Sciences focuses on plasma science and engineering, including: magnetofluid dynamics and thermionics; plasma dynamics; gaseous electronics and arc technology.

 

 

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Meet Our Editors

Editor-in-Chief
Steven J. Gitomer, Ph.D.
Senior Scientist, US Civilian Research & Development Foundation
Guest Scientist, Los Alamos National Laboratory
1428 Miracerros Loop South
Santa Fe, NM  87505  87505  USA
tps-editor@ieee.org
Phone:505-988-5751
Fax:505-988-5751 (call first)