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Turbulent dynamo in a collisionless plasma.

François Rincon1, Francesco Califano2, Alexander A Schekochihin3

  • 1Université de Toulouse, Université Paul Sabatier-Observatoire Midi-Pyrénées, Institut de Recherche en Astrophysique et Planétologie, F-31400 Toulouse, France; CNRS, Institut de Recherche en Astrophysique et Planétologie, F-31400 Toulouse, France; francois.rincon@irap.omp.eu.

Proceedings of the National Academy of Sciences of the United States of America
|April 2, 2016
PubMed
Summary
This summary is machine-generated.

Extragalactic magnetic fields are amplified by a plasma dynamo instability in collisionless plasmas. This finding supports theories of magnetic field generation in galaxy clusters and opens possibilities for laboratory experiments.

Keywords:
dynamointracluster mediummagnetic fieldsturbulence

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Area of Science:

  • Astrophysics
  • Plasma Physics
  • Cosmic Magnetism

Background:

  • Magnetic fields are crucial for astrophysical systems, but their origin and amplification in extragalactic environments remain poorly understood.
  • Current models often invoke dynamo effects, but their efficacy in weakly collisional plasmas is uncertain.
  • Previous computational limitations hindered direct investigation of these processes.

Purpose of the Study:

  • To investigate the possibility of magnetic field amplification via dynamo instability in collisionless plasmas.
  • To explore the behavior of such dynamos under different plasma conditions.
  • To assess the implications for extragalactic magnetic fields and laboratory plasma experiments.

Main Methods:

  • Utilized fully kinetic numerical simulations of the Vlasov equation in 6D-phase space.
  • Simulated a stochastically driven, nonrelativistic subsonic flow of initially unmagnetized collisionless plasma.
  • Analyzed magnetic field growth and its interplay with kinetic instabilities.

Main Results:

  • Demonstrated magnetic field amplification through dynamo instability in collisionless plasma.
  • Observed self-acceleration of the dynamo and entanglement with kinetic instabilities as magnetization increased.
  • Confirmed the feasibility of dynamo processes in weakly collisional astrophysical plasmas.

Conclusions:

  • The study confirms that plasma dynamo instability can amplify magnetic fields in collisionless environments.
  • Findings support the role of turbulence in amplifying magnetic fields within galaxy clusters.
  • Results suggest potential for realizing plasma dynamos in laboratory settings and highlight the importance of kinetic physics in astrophysics.