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  • 1
    Online Resource
    Online Resource
    Simulation studies of plasma waves in the electron foreshock: The generation of downshifted oscillations
    American Geophysical Union (AGU) ; 1990
    In:  Journal of Geophysical Research: Space Physics Vol. 95, No. A6 ( 1990-06), p. 8123-8131
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 95, No. A6 ( 1990-06), p. 8123-8131
    Abstract: The generation of waves with frequencies downshifted from the plasma frequency, as observed in the electron foreshock, is analyzed by particle simulation. Wave excitation differs fundamentally from the familiar excitation of the plasma eigenmodes by a gentle bump‐on‐tail electron distribution. Beam modes are destabilized by resonant interaction with bulk electrons, provided the beam velocity spread is very small. These modes are stabilized, starting with the higher frequencies, as the beam is broadened and slowed down by the interaction with the wave spectrum. Initially, a very cold beam is also capable of exciting frequencies considerably above the plasma frequency, but such oscillations are quickly stabilized. Low‐frequency modes persist for a long time, until the bump in the electron distribution is completely “ironed” out. This diffusion process also is quite different from the familiar case of well‐separated beam and bulk electrons. A quantitative analysis of these processes is carried out.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JA095iA06p08123
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1990
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    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
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    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    Anomalous heating by ion sound turbulence
    AIP Publishing ; 1978
    In:  The Physics of Fluids Vol. 21, No. 6 ( 1978-06-01), p. 945-955
    Details
    In: The Physics of Fluids, AIP Publishing, Vol. 21, No. 6 ( 1978-06-01), p. 945-955
    Abstract: The kinetic equation for electrons including Coulomb collisions and scattering by ion sound and related spectra is reduced to a system of equations for the energy distribution and the anisotropic part. The energy distribution is obtained for the cases where Coulomb collisions, runaway or turbulent heating dominates. Resistivity, heating rate, and the dispersion relation are significantly modified for the self-consistent non-Maxwellian distribution. Applications to turbulent heating by ion sound are made.
    Type of Medium: Online Resource
    ISSN: 0031-9171
    URL: Article
    DOI: 10.1063/1.862338
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1978
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  • 3
    Online Resource
    Online Resource
    Strong-Turbulence Theory and the Transition from Landau to Collisional Damping
    American Physical Society (APS) ; 1975
    In:  Physical Review Letters Vol. 35, No. 14 ( 1975-10-6), p. 947-950
    Details
    In: Physical Review Letters, American Physical Society (APS), Vol. 35, No. 14 ( 1975-10-6), p. 947-950
    Type of Medium: Online Resource
    ISSN: 0031-9007
    URL: Article
    DOI: 10.1103/PhysRevLett.35.947
    RVK:
    UA 1000
    RVK:
    UA 6520
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 1975
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  • 4
    Online Resource
    Online Resource
    Simulation studies of plasma waves in the electron foreshock: The generation of Langmuir waves by a gentle bump‐on‐tail electron distribution
    American Geophysical Union (AGU) ; 1990
    In:  Journal of Geophysical Research: Space Physics Vol. 95, No. A6 ( 1990-06), p. 8095-8110
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 95, No. A6 ( 1990-06), p. 8095-8110
    Abstract: The generation of Langmuir waves by a gentle bump‐on‐tail electron distribution is analyzed. It is shown that with appropriately designed simulation experiments, quasi‐linear theory can be quantitatively verified for parameters corresponding to the electron foreshock. The distribution function develops a plateau by resonant diffusion, and changes outside this velocity range are negligible, except for the contribution of nonresonant diffusion to acceleration of bulk electrons. The dispersion relation is solved for the evolving distribution function and exhibits the dynamics of wave growth and changes in real frequency. The integral of the quasi‐linear equations is also used to relate the evolution of distribution function and wave spectrum and gives agreement with the simulations. Even in extremely long simulation runs there is practically no evolution in wave energy or the distribution function, once a plateau has been formed. The saturated field levels are much lower than the estimates that are generally used to assess the importance of additional weak or strong turbulence effects. These effects cannot prevent plateau formation and are only noticeable if ions are also included in the model. They then lead to a redistribution of the spectrum toward low wave number modes which propagate mainly opposite to the beam. This occurs long after plateau formation and plays no significant role in the overall system dynamics or energy balance. One will have to live with quasi‐linear theory as a key ingredient for a global model of foreshock wave phenomena.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JA095iA06p08095
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1990
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    detail.hit.zdb_id: 3094268-8
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    SSG: 16,13
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  • 5
    Online Resource
    Online Resource
    Two-dimensional simulation studies of the electron beam-plasma instability
    AIP Publishing ; 1994
    In:  Physics of Plasmas Vol. 1, No. 6 ( 1994-06-01), p. 1821-1826
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 1, No. 6 ( 1994-06-01), p. 1821-1826
    Abstract: Two-dimensional simulations of the electron-beam plasma instability with large system size are carried out and are compared with recent one-dimensional simulations for plasma parameters appropriate to the electron foreshock. It is found that wave propagation and diffusion perpendicular to the beam drift are significant at all times. Because a plateau cannot be maintained in this case, the wave level decreases much more rapidly than in one-dimensional simulations. The nonlinear wave scattering process which occurs at late times also differs in that it generates a broad secondary spectrum rather than a condensate. The two-dimensional model, in addition, allows the investigation of the effects of increasing magnetic field strength (e.g., along auroral field lines). For intermediate magnetic fields Langmuir waves and a highly oblique spectrum belonging to the lower hybrid branch are simultaneously excited. The oblique wave spectrum for strong magnetic fields can be explained by mapping from the magnetic field direction.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.870636
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1994
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  • 6
    Online Resource
    Online Resource
    Anomalous electron transport equations for ion sound and related turbulent spectra
    AIP Publishing ; 1978
    In:  The Physics of Fluids Vol. 21, No. 6 ( 1978-06-01), p. 956-969
    Details
    In: The Physics of Fluids, AIP Publishing, Vol. 21, No. 6 ( 1978-06-01), p. 956-969
    Abstract: A complete set of anomalous electron transport equations is derived for ion sound and related spectra. Turbulence causes a drastic modification of magnitude and structure of the transport effects. The self-consistent distribution function is also used to determine wave growth. The important role of the new contributions to wave growth, resistivity, and heat conduction in experiments as well as their description by codes are discussed.
    Type of Medium: Online Resource
    ISSN: 0031-9171
    URL: Article
    DOI: 10.1063/1.862339
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1978
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    detail.hit.zdb_id: 241528-8
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  • 7
    Online Resource
    Online Resource
    Saturation of Nonlinear Explosive Instabilities
    American Physical Society (APS) ; 1969
    In:  Physical Review Letters Vol. 23, No. 20 ( 1969-11-17), p. 1149-1151
    Details
    In: Physical Review Letters, American Physical Society (APS), Vol. 23, No. 20 ( 1969-11-17), p. 1149-1151
    Type of Medium: Online Resource
    ISSN: 0031-9007
    URL: Article
    DOI: 10.1103/PhysRevLett.23.1149
    RVK:
    UA 1000
    RVK:
    UA 6520
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 1969
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  • 8
    Online Resource
    Online Resource
    Ion-Sound Spectrum and Wave-Electron Interaction in Perpendicular Shocks
    American Physical Society (APS) ; 1975
    In:  Physical Review Letters Vol. 34, No. 3 ( 1975-1-20), p. 131-134
    Details
    In: Physical Review Letters, American Physical Society (APS), Vol. 34, No. 3 ( 1975-1-20), p. 131-134
    Type of Medium: Online Resource
    ISSN: 0031-9007
    URL: Article
    DOI: 10.1103/PhysRevLett.34.131
    RVK:
    UA 1000
    RVK:
    UA 6520
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 1975
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  • 9
    Online Resource
    Online Resource
    Turbulent Heating and Quenching of the Ion Sound Instability
    American Physical Society (APS) ; 1974
    In:  Physical Review Letters Vol. 32, No. 22 ( 1974-6-3), p. 1231-1234
    Details
    In: Physical Review Letters, American Physical Society (APS), Vol. 32, No. 22 ( 1974-6-3), p. 1231-1234
    Type of Medium: Online Resource
    ISSN: 0031-9007
    URL: Article
    DOI: 10.1103/PhysRevLett.32.1231
    RVK:
    UA 1000
    RVK:
    UA 6520
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 1974
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    detail.hit.zdb_id: 208853-8
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  • 10
    Online Resource
    Online Resource
    Transition in the dispersive properties of beam‐plasma and two‐stream instabilities
    American Geophysical Union (AGU) ; 1989
    In:  Journal of Geophysical Research: Space Physics Vol. 94, No. A3 ( 1989-03), p. 2429-2442
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 94, No. A3 ( 1989-03), p. 2429-2442
    Abstract: The linear dispersion relation and the quasi‐linear evolution of the electron beam‐plasma instability are studied in intermediate regimes between the limits of the gentle bump‐on‐tail instability of Langmuir waves and purely reactive instability. The ranges of beam and plasma parameters which correspond to narrow‐banded plasma waves, broadband waves and waves with frequencies substantially below the electron plasma frequency are determined in a systematic and practical manner. The transition between these regimes and the changes in the topology of the dispersion relation are described by analytic theory and by detailed numerical solutions. All branches of the dispersion relation, including weakly damped modes which may be important in nonlinear wave coupling, are considered. Dissipative and reactive instability mechanisms are differentiated analytically and by comparing solutions of the exact dispersion relation with hybrid models using fluid components. Consequences for observations, especially in the electron foreshock, and for the design and analysis of simulation experiments are pointed out. The theory is also applicable to instabilities with ion beams or current driven instabilities. The study of the effects of increasing bulk temperature (or decreasing drift) applies in particular to the evolution from reactive Buneman instability to kinetic ion sound instability.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JA094iA03p02429
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1989
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