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Title: Magnetic-field generation and amplification in an expanding plasma
Authors: Schoeffler, K. M.
Loureiro, N. F.
Fonseca, R. A.
Silva, L. O.
Issue Date: 2014
Publisher: American Physical Society
Abstract: Particle-cell simulations are used to investigate the formation of magnetic fields B in plasmas with perpendicular electron density and temperature gradients. For system sizes L comparable to the ion skin depth d(i), it is shown that B similar to i/L, consistent with the Biermann battery effect. However, for large L/d(i), it is found that the Weibel instability (due to electron temperature anisotropy) supersedes the Biermann battery as the main producer of B. The Weibel-produced fields saturate at a finite amplitude (plasma beta approximate to 100), independent of L. The magnetic energy spectra below the electron Larmor radius scale are well fitted by the power law with slope -16/3, as predicted by Schekochihin et al.
Description: WOS:000335816700013
Peer reviewed: yes
DOI: 10.1103/PhysRevLett.112.175001
ISSN: 0031-9007
Appears in Collections:CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica

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