Physics – Plasma Physics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008napp.conf..174s&link_type=abstract
NEW ASPECTS OF PLASMA PHYSICS. Proceedings of the 2007 ICTP Summer College on Plasma Physics. Held 30 July-24 August 2007 in Abd
Physics
Plasma Physics
Scientific paper
A theoretical model for the generation of 'seed' magnetic field and plasma flow on galactic scales driven by externally given baro-clinic vectors is presented. The incompressible plasma fields can grow from zero values at initial time t = 0 from a non-equilibrium state Te ≠ Ti (where Te(Ti) are electron(ion) temperatures, respectively) due to pressure gradients. An exact analytical solution of the set of two fluid equations is obtained which is valid for both small and large plasma β-values. The magnetic field generated by this mechanism has three dimensional structure. Weaknesses of previous single fluid models for seed magnetic field generation are also pointed out. The estimate of the magnitude of the galactic seed magnetic field turns out to be 10-15 G and may vary depending upon the scale lengths of the density and temperature gradients. The seed magnetic field may be amplified later by αω-dynamo (or by some other mechanism) to the present observed values 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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