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  • 1
    Electronic Resource
    Electronic Resource
    A simulation study of the Alfvén ion-cyclotron instability in high-beta plasmas (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 108-114 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A one-dimensional electromagnetic particle-in-cell (PIC) model is used to investigate the Alfvén ion-cyclotron (AIC) instability in high-β plasmas with large ion temperature anisotropies. The simulation results are compared with linear and quasilinear theory. Nonlinear effects, such as the rate at which the anisotropy relaxes and the level of perturbed magnetic wave energy at saturation, are compared as a function of β and of the initial ion anisotropy. It is found that for large β⊥ (β⊥〉3) the anisotropy decays to a residual level in a time comparable to an ion-cyclotron period. Simulations designed to drive the instability by replenishing particles from an anisotropic temperature reservoir are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866176
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  • 2
    Electronic Resource
    Electronic Resource
    Simulation of magnetic phenomena driven by parallel ion motion (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 3398-3406 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper a one-dimensional Darwin quasineutral hybrid simulation code is used to investigate the large spatial scale (λ∼c/ωpi) low-frequency (ω∼ωci) collisionless evolution of a plasma slug of finite width traveling parallel to an ambient magnetic field in the presence of a uniform background plasma. Such a system may cause excitation of large amplitude magnetosonic waves and mixing of the background and slug ions. Under certain conditions, background ions and slug ions are driven upstream of the interaction region. Particular attention is paid to the width of the plasma slug, thermal effects, the anomalous resistivity, and the relative velocity of the two plasmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865856
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  • 3
    Electronic Resource
    Electronic Resource
    Vortex-in-cell simulations of buoyant bubbles in three dimensions (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1166-1191 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The three-dimensional evolution of one and two inviscid buoyant bubbles is studied. The study considers evolution of the buoyant bubble from the initial spherical state to the point where the bubble has formed into a vortex ring. The effect of the nonlinear interaction between two bubbles upon this evolution is also considered. This research considered a variety of density jumps across the interface with Atwood numbers ranging from 0.5 to nearly 1.0. The studies were performed with the three-dimensional vortex-in-cell code, VINCE3D. The results indicate that the evolution of either one or two bubbles follows scaling predicted from the equations being solved. This scaling holds until the bubbles become nonlinearly involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857341
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlocal theory of lower-hybrid drift instability for a plasma shell expanding into a magnetic field (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 3232-3247 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A two-fluid, nonlocal theory of the lower-hybrid drift instability is developed for a plasma shell expanding into a magnetic field. The plasma is assumed cold and the induced cross-field current is entirely due to the deceleration of the plasma by the magnetic field. Attention is focused on physically realistic cases where the cross-field electron velocity has a single-jet or double-jet profile. Lower-hybrid drift eigenmodes are found to be localized where the transverse wave velocity is resonant with the cross-field electron velocity. This is markedly different from previously analyzed cases where the cross-field velocity is constant and eigenmode localization is near the maximum of ||d ln n(x)/dx||. For double-jet cross-field velocity profiles there is a rich set of eigenmodes associated with the double-well localizing structure. Despite the different localizing mechanism and more complicated nature of eigenmodes, the parametric dependencies of the frequency and growth rate are quite similar to those obtained for constant cross-field velocity profiles. Specifically, it is found that the transverse wave number of the most rapidly growing eigenmode generally scales as kmax∼V−1/2, where V is a measure of the magnitude of the cross-field electron velocity. This scaling is approximately the same for constant, as well as single and double-jet cross-field velocity profiles. The robustness of this weak scaling of kmax with V implies that the long wavelength structures experimentally observed on expanding plasma shells are not likely to be explained by including realistic geometry effects within linear lower-hybrid drift instability theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859754
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  • 5
    Electronic Resource
    Electronic Resource
    Two-dimensional simulation of high Mach number plasma interactions (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 2444-2454 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper a hybrid particle–fluid simulation code is used to examine the large-scale (λ∼c/ωpi) low-frequency (ω∼ωci) formation and evolution of a collisonless shock in two dimensions where the shock is caused by a plasma slug of finite thickness traveling perpendicular to the ambient magnetic field in the presence of a uniform background plasma. During the evolution of the shock structure, background ions are energized in the perpendicular direction and then isotropized. The isotropization process is associated with the presence of large-amplitude, primarily electromagnetic, waves propagating parallel to the ambient magnetic field that are created by the self-consistent plasma interaction. High Mach number shocks are found to be inherently two-dimensional objects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865537
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  • 6
    Electronic Resource
    Electronic Resource
    Shock versus stochastic acceleration of impulsive solar flare protons (1988)
    Springer
    Solar physics 115 (1988), S. 133-148 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The two major candidates for proton acceleration in impulsive γ-ray producing flares, shock and stochastic acceleration, are considered in light of recent observations of mass motions and turbulence in flares. Starting with the basic problem of energies required, energy storage and the currents which must be involved, it is concluded that the primary energy release must occur close to the temperature minimum region. It is shown that energy can propagate upwards in the form of fast magnetosonic waves which become evanescent in the transition region, converting a large fraction of their energy to mass motions and turbulence. Present observations are mostly of rather coarse (7000 km) spatial resolution and it is quite possible that significantly higher velocities than those observed were present. Using the results of recent simulations of parallel shocks and the well tested theory of Lee (1983) for parallel shock acceleration in the interplanetary medium, it is shown that shock acceleration is a viable candidate at velocities slightly higher than present observations. It is also shown that shocks must be driven by a mass of material which would be visible in coronal lines such as Caxix for them to be energetically important in proton acceleration. Stochastic acceleration is examined using the hypothesis that there is an equipartition of energy between observed turbulence and magnetic field fluctuations. It is shown that this is a viable acceleration mechanism within a large range of presently observed turbulence provided that the above equipartition hypothesis is valid and the turbulent elements are of small scale (1–200 km). Since turbulence is observed in many flares without any evidence of γ-rays, one of the above conditions must not be satisfied in general. It is concluded that although present observations favor stochastic acceleration, no definitive conclusion can be made without higher spatial resolution observations and additional theoretical work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146235
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  • 7
    Electronic Resource
    Electronic Resource
    Global simulations using MHD codes: A few points to consider before you try one (1985)
    Springer
    Space science reviews 42 (1985), S. 169-185 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A survey of all global time-dependent MHD simulations is presented. The survey includes a discussion of the physical situations simulated by the respective authors as well as the numerical algorithms employed. Finally a discussion of the advantages enjoyed by certain numerical schemes and the problems that a researcher will very likely encounter if he should undertake construction of such codes is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218231
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  • 8
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    Ionospheric loss from Mars as predicted by hybrid particle simulations (2016)
    American Geophysical Union
    Details
    Publication Date: 2016-10-01
    Print ISSN: 2169-9380
    Electronic ISSN: 2169-9402
    Topics: Geosciences , Physics
    Published by American Geophysical Union
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  • 9
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    Simulation of magnetic phenomena driven by parallel ion motion (1986)
    American Institute of Physics
    Details
    Publication Date: 1986-01-01
    Print ISSN: 0031-9171
    Topics: Physics
    Published by American Institute of Physics
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  • 10
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    Nonlocal theory of lower‐hybrid drift instability for a plasma shell expanding into a magnetic field (1991)
    American Institute of Physics
    Details
    Publication Date: 1991-12-01
    Print ISSN: 0899-8221
    Topics: Physics
    Published by American Institute of Physics
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