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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.
|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.|
|Appears in Collections:||CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica|
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|publisher_version_Phys Rev Lett 2014 Schoeffler.pdf||951.59 kB||Adobe PDF||View/Open|
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