Physics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241...81d&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Oct. 1, 1980, p. 81-97.
Physics
78
Astronomical Models, Extragalactic Radio Sources, Interstellar Magnetic Fields, Magnetohydrodynamic Turbulence, Turbulence Effects, Field Theory (Physics), Kinetic Energy, Magnetic Effects, Time Dependence
Scientific paper
The need for in situ generation of magnetic energy in extended radio sources is shown to be present in all models. The question of whether such energy can be supplied by fully developed hydrodynamic turbulence is investigated through use of the nonlinear time-dependent equations of three-dimensional MHD turbulence. It is found that seed fields of about 1 nanogauss can be amplified to equipartition values in 100 million yr, but with a relatively low efficiency of 5%. The total energy requirements are consistent with estimates derived from particle reacceleration mechanisms. The production of ordered magnetic fields on very large scales is quite inefficient unless the kinetic energy input is accompanied by helical flow in all scales. Dynamical interactions with an external medium are considered to be a more likely source of large-scale field structure.
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