Artigo em revista científica Q1
The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability
Kevin M. Schoeffler (Schoeffler, K. M.); Nuno F. Loureiro (Loureiro, N. F.); Ricardo Fonseca (Fonseca, R. A.); Luís Miguel Oliveira e Silva (Silva, L. O.);
Título Revista
Physics of Plasmas
Estados Unidos da América
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An investigation of magnetic fields generated in an expanding bubble of plasma with misaligned temperature and density gradients (driving the Biermann battery mechanism) is performed. With gradient scales L, large-scale magnetic fields are generated by the Biermann battery mechanism with plasma beta similar to 1, as long as L is comparable to the ion inertial length d(i). For larger system sizes, L/d(e) > 100 (where d(e) is the electron inertial length), the Weibel instability generates magnetic fields of similar magnitude but with wavenumber kd(e) approximate to 0.2. In both cases, the growth and saturation of these fields have a weak dependence on mass ratio m(i)/m(e), indicating electron mediated physics. A scan in system size is performed at m(i)/m(e) = 2000, showing agreement with previous results with m(i)/m(e) = 25. In addition, the instability found at large system sizes is quantitatively demonstrated to be the Weibel instability. Furthermore, magnetic and electric energy spectra at scales below the electron Larmor radius are found to exhibit power law behavior with spectral indices -16/3 and -4/3, respectively. Published by AIP Publishing.
Laser-produced plasmas,Electromagnetic-field,Dynamo theory,Acceleration,Saturation
  • Ciências Físicas - Ciências Naturais
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Referência de financiamento Entidade Financiadora
UID/FIS/50010/2013 Fundação para a Ciência e a Tecnologia
ACCELERATES European Research Council
IF/00530/2013 Fundação para a Ciência e a Tecnologia