Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phpl...14g2105s&link_type=abstract
Physics of Plasmas, Volume 14, Issue 7, pp. 072105-072105-8 (2007).
Physics
3
Magnetohydrodynamics, Two-Fluid And Multi-Fluid Plasmas, Laser-Induced Magnetic Fields In Plasmas, Magnetohydrodynamics And Plasmas, Particle-Theory And Field-Theory Models Of The Early Universe, Electric And Magnetic Fields
Scientific paper
A theory for the generation of seed magnetic field and plasma flow on cosmological scales driven by externally given baroclinic vectors is presented. The Beltrami-like plasma fields can grow from zero values at initial time t=0 from a nonequilibrium state. Exact analytical solutions of the set of two-fluid equations are obtained that are valid for large plasma β-values as well. Weaknesses of previous models for seed magnetic field generation are also pointed out. The analytical calculations predict the galactic seed magnetic field generated by this mechanism to be of the order of 10-14 G, which may be amplified later by the αω dynamo (or by some other mechanism) to the present observed values of the order of ~(2-10) μG. The theory has been applied to laser-induced plasmas as well and the estimate of the magnetic field's magnitude is in agreement with the experimentally observed values.
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