IEEE Transactions on Plasma Science

Issue 2 • April 1989

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Displaying Results 1 - 25 of 35
  • Galactic model of element formation

    Publication Year: 1989, Page(s):259 - 263
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1758 KB)

    A cosmological model is presented that produces He, C, O, D, Li, Be, and B in their observed abundances without a Big Bang. The elements are produced during the 1.5-Gy formation period of a galaxy, with C, O, and other heavy elements produced by stars of M>12 M/sub 3/, He by stars of 6 M/sub s/ View full abstract»

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  • Nonperturbing plasma-focus measurements in the run-down phase

    Publication Year: 1989, Page(s):311 - 315
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Simultaneous and nonperturbing measurements using a multislit streak camera, two high-voltage probes, and a Rogowski coil were carried out to enable an equivalent-circuit analysis to be made of a plasma-focus discharge in the run-down phase. A lead current is assumed to flow to the insulator. Calculations show that maximum constant values of diode voltage, Vp≃5.3 kV, and p... View full abstract»

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  • An overview of atomic and molecular processes in critical velocity ionization

    Publication Year: 1989, Page(s):124 - 134
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    The authors present an overview of the time development of some atomic and molecular processes in critical ionization velocity (CIV). In the preonset stage, metastable states play an important role: they provide an energy pooling mechanism allowing low-energy electrons to participate in the ionization process; they may explain the low energy threshold was well as the fast time scale in the onset o... View full abstract»

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  • The dynamics of charged particles in the near wake of a very negatively charged body-laboratory experiment and numerical simulation

    Publication Year: 1989, Page(s):220 - 227
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A numerical simulation that is cylindrical in configuration space and 3-D (vx, vy, vz) in velocity space has been initiated to test a model for the near-wake dynamics of a very negatively charged body, with reference to the plasma environment around spacecraft. The simulation parameters were closely matched to those of a laboratory experi... View full abstract»

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  • The origin of current chopping in vacuum arcs

    Publication Year: 1989, Page(s):303 - 310
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A semiempirical model is presented which relates the phenomenon of current chopping of vacuum arcs to rapid microscopic processes on the cathode surface. First, for a resistive circuit the approximate chopping current as a function of power-current amplitude was calculated using two DC arc lifetime parameters which were obtained experimentally. Secondly, it is shown that spontaneous arc extinction... View full abstract»

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  • Quantization effects in the plasma universe

    Publication Year: 1989, Page(s):270 - 281
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (924 KB)

    It is suggested that a unification of the morphology of the solar system, anomalous intrinsic red shifts of quasars and galaxies, the structure of the hydrogen atom, the Einstein equations of general relativity, and Maxwell's equations can be accomplished by a basic consideration of the minimum-action states of cosmic and/or virtual vacuum field plasmas. A formalism of planetary formation theory l... View full abstract»

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  • Magnetic field-aligned plasma expansion in critical ionization velocity space experiments

    Publication Year: 1989, Page(s):116 - 123
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The temporal evolution of a plasma cloud released in an ambient plasma is studied. Time-dependent Vlasov equations for both electrons and ions, as well as the self-consistent electric field parallel to the ambient magnetic field, are solved. The initial cloud is considered to consist of cold, warm, and hot electrons with temperatures of approximately 0.2 eV, 2 eV, and 10 eV, respectively. It is fo... View full abstract»

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  • Axisymmetric particle-in-cell simulations of diamagnetic-cavity formulation in vacuum

    Publication Year: 1989, Page(s):210 - 219
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    Axisymmetric simulations of the expansion of a hot plasma suddenly introduced into a vacuum containing a weak magnetic field were performed using an electromagnetic particle-in-cell code. Both uniform and gradient fields have been used, with the simulation axis along the principal field direction. The formation of a diamagnetic cavity requires an initial plasma β>1; as the expansion procee... View full abstract»

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  • Red shift of spectral lines in the Sun's chromosphere

    Publication Year: 1989, Page(s):238 - 244
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    An unexplained center-to-limb variation (CLV) of solar wavelengths has been known for 75 years. A theory is described which not only explains this variation but also predicts its amplitude without the use of any adjustable parameter. The model considered is based on the fact that the momentum transfer of the solar photons to the electrons of the atoms of the solar atmosphere produces secondary rad... View full abstract»

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  • On the surface tension of plasmas

    Publication Year: 1989, Page(s):284 - 289
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The electric field energy in the inhomogeneous surface of a plasma (due to the presence of a double layer at the surface) divided by the surface area defines a surface tension. Two cases of interest are studied. First, the magnitude of the surface tension for a thermally produced double plasma layer is evaluated. Secondly, the surface tension for a double layer at the surface of a degenerate elect... View full abstract»

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  • Observable consequences of Langmuir turbulence in active galactic nuclei

    Publication Year: 1989, Page(s):252 - 258
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The author discusses in detail the observable consequences of nonlinear microscopic plasma processes in active galactic nuclei. The combination of several elementary momentum-gain (shock acceleration and stochastic acceleration) and momentum-loss processes (synchrotron radiation, inverse Compton scattering) produces an almost monoenergetic distribution function of relativistic electrons, called th... View full abstract»

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  • A heat-driven monochromatic light source

    Publication Year: 1989, Page(s):295 - 302
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The efficiency with which heat may be converted into resonance radiation in a cesium thermionic diode is investigated theoretically. An analytical model of a thermionic converter is used which combines the coupled effects of line radiation transport, excited-state kinetics, and plasma diffusion. Operating regimes are established for various degrees of optical density in the plasma. The results ind... View full abstract»

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  • Cosmic matter and the nonexpanding universe

    Publication Year: 1989, Page(s):264 - 269
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The authors examine how some observations involving plasma physics in space are compatible with a recent red-shift theory. An increasingly large number of observations consistently reveal the existence of a much larger amount of intergalactic matter than presently accepted. A radio signal coming from directions between galaxies is discussed. An average density of matter in space of about 0.01 atom... View full abstract»

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  • Recent improvements in the numerical scheme of estimating field-aligned current systems from ground magnetometer records

    Publication Year: 1989, Page(s):158 - 166
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    The capability of ground-based magnetometer data of estimating field-aligned current system is discussed. Starting with some basic equations governing electrodynamic parameters in the ionosphere, the author describes both the advantages and limitations of the algorithms known as magnetogram-inversion techniques. It is pointed out that the proposed numerical scheme has been considerably improved so... View full abstract»

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  • Dynamics of a collisional, capacitive RF sheath

    Publication Year: 1989, Page(s):338 - 341
    Cited by:  Papers (183)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A self-consistent solution for the dynamics of a high-voltage, capacitive RF sheath driven by a sinusoidal current source is obtained, under the assumptions of time-independent, collisional ion motion and inertialess electrons. Values of the ion current density, the sheath capacitance per unit area for the fundamental voltage harmonic, and the conductance per unit area for stochastic heating by th... View full abstract»

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  • Observations of distortions of optical features in the UV auroral distribution

    Publication Year: 1989, Page(s):109 - 115
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1144 KB)

    Observations made by the Viking satellite have for the first time shown the development of multiple large-scale surge features. The longer time scale of the features is contrasted with smaller-scale vortex streets found along the poleward edge of the evening oval, which are generally observed to exist for less than 2 min. The ratio of wavelength-to-diameter of these features is shown to decrease w... View full abstract»

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  • Spacecraft charging potential during electron-beam injections into space plasmas

    Publication Year: 1989, Page(s):205 - 209
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Injections of nonrelativistic electron beams from an infinite conductor have been simulated by using a two-dimensional electrostatic particle code to study the spacecraft charging potential. The simulations show that the conductor charging potential at the end of simulations does not vary with the beam density when the beam density exceeds four times the ambient density. The reflection coefficient... View full abstract»

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  • Feasibility of local power losses determination in the TJ-II heliac using movable bolometers

    Publication Year: 1989, Page(s):316 - 322
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    A method to fully diagnose energy losses in plasma devices with a reduced experimental setup is presented. This technique is based on the use of single movable detectors instead of full detector arrays, and it is especially suitable for devices with large toroidal and/or poloidal asymmetries, such as the TJ-II flexible heliac, that would require a large number of measurements at different position... View full abstract»

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  • Global magnetohydrodynamic simulations of the magnetosphere

    Publication Year: 1989, Page(s):135 - 149
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2156 KB)

    The authors demonstrate the use of a global MHD (magnetohydrodynamic) simulations to study the magnetospheric configuration by reviewing some of the results obtained from the Ogino model. The authors start by considering the steady-state configuration of the magnetosphere in the absence of an IMF (interplanetary magnetic field), and then demonstrate how that configuration is changed when a northwa... View full abstract»

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  • The role of dust particles with large gyroradii in the `2/3' fall-down process

    Publication Year: 1989, Page(s):228 - 237
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    The authors consider the Alfven-Arrhenius fall-down process and propose a mechanism whereby the Rosseland electric field (the field needed to maintain quasineutrality) may be responsible for the capture and confinement of large-gyroradius dust particles within a plasma shell stratified along the direction of the magnetic-field lines. For these particles, the effect of the magnetic force is rather ... View full abstract»

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  • Disproof of Cowling's theorem

    Publication Year: 1989, Page(s):282 - 283
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    T.G. Cowling's theorem (1934) is a general statement that axisymmetric dynamos cannot be constructed in astrophysical bodies. The theorem is based on the assumption that the electrical conductivity is a scalar, σE=J. In a counterargument, the author demonstrates that this statement is not valid for a diffuse plasma. He suggests that, in an astrophysical plasma, collisional ... View full abstract»

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  • Plasma suppression of synchrotron emission from radio-quiet infrared quasars

    Publication Year: 1989, Page(s):245 - 251
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The authors calculate the synchrotron emission from a power-law distribution of relativistic electrons in a large-scale random magnetic field of strength B embedded in the thermal plasma of density ne. Due to the presence of the plasma, two major modifications of the classical vacuum theory of synchrotron emission are established: (1) synchrotron sources can be optical... View full abstract»

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  • Surface waves in laser-produced plasma double layers

    Publication Year: 1989, Page(s):290 - 294
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The surface-tension pressure for a charged double layer is calculated. This result is used to derive the dispersion relation for surface waves. The stability criterion defines stable surface waves with wavelength λsw<8πλD (λ D is the Debye length) which can be obtained at the critical surface of a laser-plasma interaction system. These ri... View full abstract»

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  • Field-aligned currents and convection patterns in the southern polar cap during stable northward, southward, and azimuthal IMF

    Publication Year: 1989, Page(s):167 - 173
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    Equivalent ionospheric current patterns are derived from ground-based geomagnetic observations for events on 11-12 November 1979 (Bz≫0), 24 November 1981 (Bz≪0), 10-11 January 1980 (By ≫0) and 25-26 November 1979 (By ≪0), when the corresponding IMF (interplanetary magnetic field) conditions remained stable.... View full abstract»

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  • Anode spot plasma torch

    Publication Year: 1989, Page(s):342 - 343
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    With acetone as a catalyst in an argon discharge plasma, it is observed that localized high-density anode spots can be formed at sharp edges in the plasma. By placing the sharp edge on top of a small permanent magnet, the current which is attracted to the spot can locally burn a piece of metal beneath the sharp edge. It is believed that the practical significance of these results may have wide imp... 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
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