Particle acceleration in galaxy clusters via MHD turbulence

2006 ◽  
Vol 327 (5-6) ◽  
pp. 615-618 ◽  
Author(s):  
G. Brunetti
Keyword(s):  
Particle Acceleration ◽  
Galaxy Clusters ◽  
Mhd Turbulence

scholarly journals Models of particle acceleration in galaxy clusters by MHD turbulence

2009 ◽  
Vol 5 (H15) ◽  
pp. 466-467
Author(s):  
G. Brunetti
Keyword(s):  
Particle Acceleration ◽  
Radio Emission ◽  
Galaxy Clusters ◽  
Indirect Evidence ◽  
Mhd Turbulence ◽  
Radio Data ◽  
Central Cluster ◽  
Relativistic Particles

AbstractPresent radio data provide indirect evidence that diffuse radio emission in the central cluster regions may originate from turbulent-acceleration of relativistic particles. I was invited to discuss models of particle acceleration by MHD turbulence in clusters and in these pages I briefly touch the main points of my talk.

scholarly journals High energy emission from galaxy clusters and particle acceleration due to MHD turbulence

2009 ◽  
Author(s):  
G. Brunetti ◽  
P. Blasi ◽  
R. Cassano ◽  
S. Gabici ◽  
Denis Bastieri ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
Galaxy Clusters ◽  
High Energy ◽  
Mhd Turbulence ◽  
Energy Emission ◽  
High Energy Emission

scholarly journals Regulation of Thermal Conductivity in Hot Galaxy Clusters by MHD Turbulence

2008 ◽  
Vol 681 (2) ◽  
pp. L65-L68 ◽  
Author(s):  
Steven A. Balbus ◽  
Christopher S. Reynolds
Keyword(s):  
Thermal Conductivity ◽  
Galaxy Clusters ◽  
Mhd Turbulence

TRANSPORT EQUATION FOR MHD TURBULENCE: APPLICATION TO PARTICLE ACCELERATION AT INTERPLANETARY SHOCKS

2009 ◽  
Vol 696 (1) ◽  
pp. 261-267 ◽  
Author(s):  
Igor V. Sokolov ◽  
Ilia I. Roussev ◽  
Marina Skender ◽  
Tamas I. Gombosi ◽  
Arcadi V. Usmanov
Keyword(s):  
Particle Acceleration ◽  
Transport Equation ◽  
Interplanetary Shocks ◽  
Mhd Turbulence

scholarly journals Particle Acceleration in the Heliosphere

1995 ◽  
Vol 10 ◽  
pp. 307-309
Author(s):  
Loukas Vlahos
Keyword(s):  
Particle Acceleration ◽  
Energy Dissipation ◽  
Electric Field ◽  
Solar Surface ◽  
Interplanetary Medium ◽  
Acceleration Process ◽  
Mhd Turbulence ◽  
Dissipation Process ◽  
Planetary Magnetospheres ◽  
Dissipation Processes

The heliosphere could be divided in three major acceleration Laboratories, the solar surface (Laboratory 1), the interplanetary medium (Laboratory 2) and Earth and Planetary magnetospheres (Laboratory 3). Our understanding of the acceleration process depends strongly on the nature of the drivers and the energy dissipation process. The energy gain by a particle with velocity where is the variation of the electric field in space and time. All three Laboratories mentioned above share a common characteristic, the drivers and the energy dissipation processes are closely connected to fully developed MHD turbulence. We can show that our understanding of particle acceleration depends strongly on the interaction of particles with fields resulting from fully developed MHD turbulence.

scholarly journals Energetic Particle Acceleration in Compressible Magnetohydrodynamic Turbulence

2021 ◽  
Vol 922 (2) ◽  
pp. 209
Author(s):  
Jian-Fu Zhang ◽  
Fu-Yuan Xiang
Keyword(s):  
Particle Acceleration ◽  
Energetic Particle ◽  
Early Stage ◽  
High Energy ◽  
Compressible Turbulence ◽  
Mode Interaction ◽  
Acceleration Of Particles ◽  
Power Law Distribution ◽  
Mhd Turbulence ◽  
Energetic Particle Acceleration

Abstract Magnetohydrodynamic (MHD) turbulence is an important agent of energetic particle acceleration. Focusing on the compressible properties of magnetic turbulence, we adopt the test particle method to study the particle acceleration from Alfvén, slow, and fast modes in four turbulence regimes that may appear in a realistic astrophysical environment. Our studies show that (1) the second-order Fermi mechanism drives the acceleration of particles in the cascade processes of three modes by particle-turbulence interactions, regardless of whether the shock wave appears; (2) not only can the power spectra of maximum-acceleration rates reveal the inertial range of compressible turbulence, but also recover the scaling and energy ratio relationship between the modes; (3) fast mode dominates the acceleration of particles, especially in the case of super-Alfvénic and supersonic turbulence, slow mode dominates the acceleration for sub-Alfvénic turbulence in the very-high-energy range, and the acceleration of Alfvén mode is significant at the early stage of the acceleration; (4) particle acceleration from three modes results in a power-law distribution in the certain range of evolution time. From the perspective of particle-wave mode interaction, this paper promotes the understanding for both the properties of turbulence and the behavior of particle acceleration, which will help provide insight into astrophysical processes involved in MHD turbulence.

scholarly journals Discovery of radio haloes and double relics in distant MACS galaxy clusters: clues to the efficiency of particle acceleration

2012 ◽  
Vol 426 (1) ◽  
pp. 40-56 ◽  
Author(s):  
A. Bonafede ◽  
M. Brüggen ◽  
R. van Weeren ◽  
F. Vazza ◽  
G. Giovannini ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
Galaxy Clusters

scholarly journals PARTICLE ACCELERATION AND NON-THERMAL EMISSION FROM GALAXY CLUSTERS

2004 ◽  
Vol 37 (5) ◽  
pp. 493-500 ◽  
Author(s):  
GIANFRANCO BRUNETTI
Keyword(s):  
Particle Acceleration ◽  
Galaxy Clusters ◽  
Thermal Emission
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