July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Weibel instability in anisotropically inhomogeneous plasmas

Aug 4, 2015, 4:00 PM
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 190
Poster contribution CR-TH Poster 3 CR


Sara Tomita (Aoyama Gakuin University)


The Weibel instability is thought to be important for particle acceleration and generation of magnetic fields in relativistic shocks. However, the magnetic field produced by the Weibel instability cannot occupy large regions because of the rapid decay. Non-linear evolution of the Weibel instability has been investigated in uniform plasmas or shocks propagating into uniform plasmas so far. In order to study non-linear evolution of the Weibel instability in inhomogeneous background plasmas, we perform two-dimensional particle in cell simulations. We find that spatially anisotropic density structures produce anisotropic velocity distributions, so that the magnetic field fluctuations are excited by the Weibel instability. Relativistic shocks propagating into inhomogeneous plasmas are expected to produce such anisotropic density structures in the downstream region. Therefore, magnetic fields generated by the Weibel instability could occupy regions larger than previously thought. If so, the maximum energy of accelerated particles would become larger than previously thought.
Registration number following "ICRC2015-I/" 408
Collaboration -- not specified --

Primary author

Sara Tomita (Aoyama Gakuin University)


Yutaka Ohira (Aoyama Gakuin University)

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