TY  - INPR
A1  - Seehafer, Norbert
T1  - Nature of the α effect in magnetohydrodynamics
N2  - It is shown that the ff effect of mean-field magnetohydrodynamics, which consists in 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 simultaneous 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 ff effect can increase the energy in the mean magnetic field only under the condition that also magnetic helicity is accumulated there.
T3  - NLD Preprints - 25 
Y1  - 2007
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/1266
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:517-opus-13919
ER  -