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Plasma Science, IEEE Transactions on

Issue 2 • Date 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 (3)
    Save to Project icon | Request Permissions | 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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  • Observable consequences of Langmuir turbulence in active galactic nuclei

    Publication Year: 1989 , Page(s): 252 - 258
    Save to Project icon | Request Permissions | 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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  • Electrodynamics of solar wind-magnetosphere-ionosphere interactions

    Publication Year: 1989 , Page(s): 83 - 108
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2544 KB)  

    The authors present a coherent picture of fundamental physical processes in three basic elements of the SW-I (solar wind-magnetosphere-ionosphere) coupling system: (i) the field-aligned potential structure which leads to the formation of auroral arcs; (ii) the magnetosphere coupling which leads to the onset of magnetospheric substorms; and (iii) the solar wind-magnetosphere dynamo which supplies t... 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
    Save to Project icon | Request Permissions | 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 (35)
    Save to Project icon | Request Permissions | 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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  • Global magnetohydrodynamic simulations of the magnetosphere

    Publication Year: 1989 , Page(s): 135 - 149
    Save to Project icon | Request Permissions | 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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  • Plasma suppression of synchrotron emission from radio-quiet infrared quasars

    Publication Year: 1989 , Page(s): 245 - 251
    Save to Project icon | Request Permissions | 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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  • Stockholm, August 1956, Revisited [plasma astrophysics]

    Publication Year: 1989 , Page(s): 69 - 72
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB)  

    The author believes that the modern-day foundations of the plasma universe can be traced to a significant degree to the International Astronomical Union Symposium number 6 held in August, 1956, in Stockholm. He offers a few observations on the subjects and presentations at the Symposium which interest him most and the developments over the last three decades which have been closest to his own work 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
    Save to Project icon | Request Permissions | 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)
    Save to Project icon | Request Permissions | 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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  • Magnetic field-aligned plasma expansion in critical ionization velocity space experiments

    Publication Year: 1989 , Page(s): 116 - 123
    Save to Project icon | Request Permissions | 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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  • A heat-driven monochromatic light source

    Publication Year: 1989 , Page(s): 295 - 302
    Save to Project icon | Request Permissions | 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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  • 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
    Save to Project icon | Request Permissions | 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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  • Birkeland's electromagnetic gun: a historical review

    Publication Year: 1989 , Page(s): 73 - 82
    Cited by:  Papers (14)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1504 KB)  

    After a brief biography of K.B. Birkeland, the author describes Birkeland's electromagnetic gun project and provides details of the so-called Gala lecture at the University of Oslo on Feb. 6, 1903, when Birkeland officially demonstrated his gun. The future potential of Birkeland's gun for mass transport and rocket launches is also examined View full abstract»

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  • Cosmic matter and the nonexpanding universe

    Publication Year: 1989 , Page(s): 264 - 269
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | 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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  • Excitation of linearly stable waves in a multispecies plasma

    Publication Year: 1989 , Page(s): 201 - 204
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (304 KB)  

    Excitation of electrostatic modes as a result of the injection of an argon beam into a multispecies plasma is investigated. It is shown that the injection of a warm artificial beam into a thermal plasma may excite waves of significant amplitude with a range of phase velocities which are linearly stable. These waves appear as a result of the correlation between motions of an individual particle in ... View full abstract»

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  • Disproof of Cowling's theorem

    Publication Year: 1989 , Page(s): 282 - 283
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | 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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  • Electric fields in the magnetosphere-the evidence from ISEE, GEOS and Viking

    Publication Year: 1989 , Page(s): 174 - 185
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1036 KB)  

    Electric field measurements on the satellites GEOS-1, GEOS-2, ISEE-1, and Viking have extended the empirical knowledge of electric fields in space to include the outer regions of the magnetosphere. While the measurements confirm some of the theoretically expected properties of the electric fields, they also reveal unexpected features and a high degree of complexity and variability. The existence o... View full abstract»

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  • Velocity relaxation of injected H0 particles into a high-temperature hydrogen plasma

    Publication Year: 1989 , Page(s): 330 - 337
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (604 KB)  

    The velocity relaxation of an H0 beam injected into high-temperature plasma is analyzed by deriving a Fokker-Planck-type equation. The diffusion rate in the velocity space of an H0 particle is directly proportional to the plasma temperature. Thus the effective energy relaxation of the H0 beam in the high-temperature plasma would be expected. It is shown that the Fo... 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
    Save to Project icon | Request Permissions | 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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  • Red shift of spectral lines in the Sun's chromosphere

    Publication Year: 1989 , Page(s): 238 - 244
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | 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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  • The pulsed discharge arc resistance and its functional behavior

    Publication Year: 1989 , Page(s): 323 - 329
    Cited by:  Papers (39)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (540 KB)  

    A generalized comparison of several theoretical and empirical arc-resistance equations was conducted by normalizing the theoretical and experimental arc-resistance values at t=0.5 μs (approximate time of maximum arc current). It was found that the arc-resistance equations considered could be grouped according to their functional form and were either of the inverse integral or inverse e... 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 (12)
    Save to Project icon | Request Permissions | 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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  • A new model for auroral breakup during substorms

    Publication Year: 1989 , Page(s): 150 - 157
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (756 KB)  

    A model for substorm breakup is developed, based on (1) the relaxation of stretched (closed) dipolar field lines, and (2) the formation of an incipient current wedge within a single arc structure. It is argued that the establishment of a coupled current structure within a single arc leads to a quasistable system, i.e. the prebreakup regime. Perturbation of the prebreakup structure leads to an inst... 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
    Save to Project icon | Request Permissions | 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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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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Editor-in-Chief
Steven J. Gitomer, Ph.D.
Senior Scientist, US Civilian Research & Development Foundation
Guest Scientist, Los Alamos National Laboratory
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