IEEE Transactions on Plasma Science

Volume 17 Issue 2 • April 1989

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Displaying Results 1 - 25 of 35
  • Stockholm, August 1956, Revisited (plasma astrophysics)

    Publication Year: 1989, Page(s):69 - 72
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (394 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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  • Birkeland's electromagnetic gun: a historical review

    Publication Year: 1989, Page(s):73 - 82
    Cited by:  Papers (25)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1633 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.<<ETX>> View full abstract»

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  • Electrodynamics of solar wind-magnetosphere-ionosphere interactions

    Publication Year: 1989, Page(s):83 - 108
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2991 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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  • 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 (1175 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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  • 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 (804 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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  • 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 (1040 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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  • Global magnetohydrodynamic simulations of the magnetosphere

    Publication Year: 1989, Page(s):135 - 149
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2351 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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  • A new model for auroral breakup during substorms

    Publication Year: 1989, Page(s):150 - 157
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (893 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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  • 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 (960 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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  • 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 (800 KB)

    Equivalent ionospheric current patterns are derived from ground-based geomagnetic observations for events on 11-12 November 1979 (B/sub z/>>0), 24 November 1981 (B/sub z/<<0), 10-11 January 1980 (B/sub y/ >>0) and 25-26 November 1979 (B/sub y/<<0), when the corresponding IMF (interplanetary magnetic field) conditions remained stable. The 'radar scanning' technique was used ... 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 (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 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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  • Ion conics and counterstreaming electrons generated by lower hybrid waves in the Earth's magnetosphere

    Publication Year: 1989, Page(s):186 - 195
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    The exotic phenomenon of energetic ion-conic and counterstreaming electron formulation by lower hybrid waves along the discrete auroral field lines in the Earth's magnetosphere is considered. Mean particle calculations, plasma simulations, and analytical treatments of the acceleration processes are described. It is shown that, in the primary auroral electron-beam region, lower hybrid waves could b... View full abstract»

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  • Magnetic-field fluctuations from 0 to 26 Hz observed from a polar-orbiting satellite

    Publication Year: 1989, Page(s):196 - 200
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (802 KB)

    Data from the Viking magnetic-field experiment are described which demonstrate the diverse types of magnetic fluctuations which may be observed from a polar-orbiting satellite. The Viking observations provide an opportunity to observe Pc 1 waves at middle-latitudes above the ionosphere and to determine the spectral structure and polarization of the waves. ULF/ELF broadband noise represents a secon... View full abstract»

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  • Excitation of linearly stable waves in a multispecies plasma

    Publication Year: 1989, Page(s):201 - 204
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (358 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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  • Spacecraft charging potential during electron-beam injections into space plasmas

    Publication Year: 1989, Page(s):205 - 209
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 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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  • 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 (1004 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 beta >1; as the expansion proceed... 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 (721 KB)

    A numerical simulation that is cylindrical in configuration space and 3-D (v/sub x/, v/sub y/, v/sub z/) 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 experiment so that the results may be compared d... 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 (776 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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  • 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 (857 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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  • 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 (475 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 n/sub e/. 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 optically thick only in a rath... 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 (708 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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  • 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/<M<12 M/sub s/, and D, Li, Be, and B by cosmic-ray reactions in a nearly pure H plasma halo. Thu... 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 (677 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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  • Quantization effects in the plasma universe

    Publication Year: 1989, Page(s):270 - 281
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1091 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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  • 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 (133 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, sigma E=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 processes can viola... View full abstract»

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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
1428 Miracerros Loop South
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