Fast reconnection in relativistic pair plasmas: Analysis of particle acceleration in self-consistent full particle simulations

2004 ◽  
Vol 11 (3) ◽  
pp. 1151-1163 ◽  
Author(s):  
C. H. Jaroschek ◽  
R. A. Treumann ◽  
H. Lesch ◽  
M. Scholer
Keyword(s):  
Particle Acceleration ◽  
Self Consistent ◽  
Particle Simulations ◽  
Fast Reconnection ◽  
Relativistic Pair

scholarly journals Bohm Diffusion and Cosmic-Ray-Modified Shocks

1994 ◽  
Vol 142 ◽  
pp. 981-983
Author(s):  
Peter Duffy
Keyword(s):  
Particle Acceleration ◽  
Cosmic Rays ◽  
Cosmic Ray ◽  
Shock Acceleration ◽  
Back Reaction ◽  
Acceleration Of Particles ◽  
Diffusive Shock Acceleration ◽  
Spacetime Structure ◽  
Wide Range ◽  
Self Consistent

AbstractA numerical solution to the problem of self-consistent diffusive shock acceleration is presented. The cosmic rays are scattered, accelerated and exert a back-reaction on the gas through their interaction with turbulence frozen into the local fluid frame. Using a grid with a hierarchical spacetime structure the physically interesting limit of Bohm diffusion (к ∝ pv), which introduces a wide range of diffusion lengthscales and acceleration timescales, can be studied. Some implications for modified shocks and particle acceleration are presented.Subject headings: acceleration of particles — cosmic rays — diffusion — shock waves

scholarly journals Radio and X-ray diagnostics of electrons accelerated in solar flares

2006 ◽  
Vol 2 (14) ◽  
pp. 88-88
Author(s):  
Miroslav Bárta ◽  
Marian Karlický
Keyword(s):  
Particle Acceleration ◽  
Solar Flare ◽  
Test Particle ◽  
Solar Flares ◽  
Global Scale ◽  
X Ray ◽  
Particle Simulations

AbstractStarting from 2.5D MHD modelling of solar flares on a global scale we calculate (using the PIC and test-particle simulations) the radio and X-ray emissions generated in solar flare reconnection. Our results – the radio and X-ray spectra and brightness distributions, and their dynamics – are directly comparable with observations providing thus a test of particle acceleration models as well as of the ‘standard’ global flare scenario.

scholarly journals Particle acceleration in fast magnetic reconnection

2010 ◽  
Vol 6 (S274) ◽  
pp. 62-71
Author(s):  
A. Lazarian ◽  
G. Kowal ◽  
E. de Gouveia Dal Pino ◽  
E. Vishniac
Keyword(s):  
Magnetic Field ◽  
Particle Acceleration ◽  
Numerical Simulations ◽  
Large Scale ◽  
Particle Accelerator ◽  
Fermi Acceleration ◽  
Origin And Evolution ◽  
First Order ◽  
Large Scale Magnetic Field ◽  
Fast Reconnection

AbstractOur numerical simulations show that the reconnection of magnetic field becomes fast in the presence of weak turbulence in the way consistent with the Lazarian & Vishniac (1999) model of fast reconnection. This process in not only important for understanding of the origin and evolution of the large-scale magnetic field, but is seen as a possibly efficient particle accelerator producing cosmic rays through the first order Fermi process. In this work we study the properties of particle acceleration in the reconnection zones in our numerical simulations and show that the particles can be efficiently accelerated via the first order Fermi acceleration.

scholarly journals Particle acceleration and foreshock evolution in heliospheric shocks from self-consistent Monte Carlo simulations

2016 ◽  
Author(s):  
Alexandr Afanasiev ◽  
Rami Vainio ◽  
Markus Battarbee ◽  
Minna Palmroth ◽  
Sebastian von Alfthan ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Particle Acceleration ◽  
Monte Carlo Simulations ◽  
Self Consistent

Evidence and analysis of ion/electron foreshocks for a curved shock in Subcritical regime:   2D self-consistent PIC simulations 

2020 ◽  
Author(s):  
Philippe Savoini ◽  
Bertrand Lembege
Keyword(s):  
Shock Front ◽  
Ion Distribution ◽  
Supercritical Regime ◽  
Time Dynamics ◽  
Subcritical Regime ◽  
Ion Distributions ◽  
Self Consistent ◽  
Electron Distributions ◽  
Particle Simulations ◽  
Pic Code

<p>Since early 2D PIC full self-consistent quasi-perpendicular simulations of the foreshock region [Savoini et Lembege, 2001] performed for a supercritical regime, different efforts have been invested later on to analyze the foreshock region. Previous 2D PIC simulations have succeeded in recovering both the local electron distribution [Savoini and Lembege, 2001] and the ion distribution [Savoini et al., 2013] in good agreement with the in-situ experimental data. These studies have retrieved both kinds of distributions and have analyzed in detail how these local distributions vary versus (i) the local angle Θ<sub>Bn</sub> to the curved shock (defined between the normal of the shock front and the upstream interplanetary magnetic field) and (ii) the distance from the shock front, in order to identify in detail the different acceleration mechanisms at work at the curved front and supporting these local ion and electron distributions within the foreshock region [Savoini and Lembege, 2001, 2015; Savoini et al, 2013]. This last point can only be accessible to a self-consistent approach (where ion and electron scales are fully included) as in 2D PIC simulations.  </p><p>Then, the present work is an extension of the previous analyses listed above for a curved (quasi-perpendicular) shock applied now in a <strong>subcritical regime</strong>. This work is performed thanks to a new 2D parallel PIC code (SMILEI) which is highly optimized and allows much higher statistics. The main characteristics of the curved front microstructures, its time dynamics, and preliminary results on local distribution functions obtained for both electrons and ions in this new Mach regime will be presented.      </p><p>Savoini, P. and B. Lembege, « Two-dimensional simulations of a curved shock: Self-consistent formation of the electron foreshock »,  J. Geophys. Res., Vol. 106, A7, 12975-12992, <strong>2001</strong></p><p>Savoini P., B. Lembege and J. Stienlet, « On the origin of the quasi-perpendicular ion foreshock: Full-particle simulations”, J. Geophys. Res., V. 118, 1–14, doi:10.1002/jgra.50158, <strong>2013</strong><strong> </strong></p><p>Savoini P. and B. Lembege, “Production of nongyrotropic and gyrotropic backstreaming ion distributions in the quasi-perpendicular ion foreshock region”, J. Geophys. Res., V. 120, 7154–7171, doi: 10.1002/2015JA021018, <strong>2015</strong>.</p>

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