Journal ArticleDOI
Effect of strong thermalization on shock dynamical behavior
N. Shimada,Masahiro Hoshino +1 more
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In this paper, the authors examined the dynamics of the perpendicular shock front under various plasma parameters by using particle-in-cell numerical simulation and found that the self-reformation process can be modified in high Mach number regime.Abstract:
[1] The dynamics of the perpendicular shock front is examined under various plasma parameters by using particle-in-cell numerical simulation. As widely accepted, above the critical Mach number (∼3) the front of (quasi-)perpendicular shocks show nonstationary behavior due to the shock self-reformation. In much higher Mach number regime (MA > 20), we find that dynamics of the shock front self-reformation can be modified. Nonlinear evolution of microinstabilities in the shock transition region results turbulent profiles in a microscopic view (≤c/ωpe), while, from a macroscopic view (>several c/ωpe) because of rapid, strong thermalization in the shock transition region, the localized accumulation of the plasma due to ion dynamics is smeared out in both of the velocity phase space and real space. As a result, the shock self-reformation is realized within a reduced time and space. We can say there is a possibility that rapid, strong dissipation helps to stabilize the macroscopic shock front dynamics; the shock self-reformation still persists, though. The strong thermalization is caused by the nonlinear evolution of two-stream instability between the electron and the reflected/incident ion components and following ion-acoustic instability. We think that the modification of the shock self-reformation process observed in high Mach number regime indicates an important role of electron kinetics and heating in the macroscopic shock front behavior.read more
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Journal ArticleDOI
Fundamentals of collisionless shocks for astrophysical application, 2. Relativistic shocks
TL;DR: A comprehensive review of the theory and properties of non-relativistic shocks in hot collisionless plasmas is given in this paper, in view of their possible application in astrophysics.
Journal ArticleDOI
On microinstabilities in the foot of high Mach number perpendicular shocks
TL;DR: In this article, a two-dimensional full particle simulation with periodic boundary conditions in both directions using the physical ion to electron mass ratio is performed as a proxy for the foot region where incoming and specularly reflected ions overlap.
Journal ArticleDOI
Electron shock surfing acceleration in multidimensions: two-dimensional particle-in-cell simulation of collisionless perpendicular shock
Takanobu Amano,Masahiro Hoshino +1 more
TL;DR: In this paper, the acceleration mechanism of high-Mach-number collisionless shocks propagating in a weakly magnetized medium is investigated using a self-consistent two-dimensional particle-in-cell simulation.
Journal ArticleDOI
Electron Injection at High Mach Number Quasi-perpendicular Shocks: Surfing and Drift Acceleration
Takanobu Amano,Masahiro Hoshino +1 more
TL;DR: In this article, the process of electron injection at high Mach number, collisionless, quasi-perpendicular shock waves is investigated by means of one-dimensional electromagnetic particle-in-cell simulations.
Journal ArticleDOI
Fundamentals of collisionless shocks for astrophysical application, 2. Relativistic shocks
TL;DR: In this paper, the authors review recent progress on collisionless relativistic shocks, including its predictions and limitations, including the sensitivity of particle dynamics on the upstream magnetic inclination angle.
References
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Journal ArticleDOI
Relativistic Magnetosonic Shock Waves in Synchrotron Sources: Shock Structure and Nonthermal Acceleration of Positrons
TL;DR: In this article, the theoretical properties of relativistic, transverse, magnetosonic collisionless shock waves in electron-positron-heavy ion plasmas of relevance to astrophysical sources of synchrotron radiation are investigated.
Journal ArticleDOI
The resolved layer of a collisionless, high β, supercritical, quasi‐perpendicular shock wave: 1. Rankine‐Hugoniot geometry, currents, and stationarity
J. D. Scudder,André Mangeney,Catherine Lacombe,C. C. Harvey,T. L. Aggson,Roger R. Anderson,J. T. Gosling,G. Paschmann,Christopher T. Russell +8 more
TL;DR: In this paper, data collected by the ISEE dual-spacecraft mission (on November 7, 1977) on a slowly moving, supercritical, high-beta, quasi-perpendicular bow shock are presented, and the local geometry, spatial scales, and stationarity of this shock wave are assessed in a self-consistent Rankine-Hugoniot-constrained frame of reference.
Journal ArticleDOI
Cyclic behavior at quasi-parallel collisionless shocks
TL;DR: In this paper, large scale one-dimensional hybrid simulations with resistive electrons have been carried out of a quasi-parallel high-Mach-number collisionless shock, where the shock initially appears stable, but then exhibits cyclic behavior.
Journal ArticleDOI
Nonthermal Electrons at High Mach Number Shocks: Electron Shock Surfing Acceleration
Masahiro Hoshino,N. Shimada +1 more
TL;DR: In this article, the suprathermal electron acceleration mechanism in a perpendicular magnetosonic shock wave in a high Mach number regime was studied by using a particle-in-cell simulation, and it was shown that the electrons are likely to be trapped by solitary waves and during the trapping phase they can be effectively accelerated by the shock motional/convection electric field.
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