Nature of the α effect in magnetohydrodynamics

Details Nature of the α effect in magnetohydrodynamics Nature of the α effect in magnetohydrodynamics

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrve..53.1283s&link_type=abstract

Physical Review E (Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics), Volume 53, Issue 1, January 1996

Physics

42

Plasma Dynamics And Flow, Magnetohydrodynamics And Plasmas

Scientific paper

It is shown that the α effect of mean-field magnetohydrodynamics, which consists of the generation of a mean electromotive force along the mean magnetic field by turbulently fluctuating parts of velocity and magnetic field, is equivalent to the simulaneous generation of both turbulent and mean-field magnetic helicities, the generation rates being equal in magnitude and opposite in sign. In the particular case of statistically stationary and homogeneous fluctuations this implies that the α effect can increase the energy in the mean magnetic field only under the condition that magnetic helicity is also accumulated there.

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