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URN: urn:nbn:de:kobv:517-opus-13919
URL: http://opus.kobv.de/ubp/volltexte/2007/1391/
Seehafer, Norbert
Nature of the α effect in magnetohydrodynamics
Kurzfassung in Englisch
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.
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PACS - Klassifikation: |
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95.30.Qd , 47.65.+a , 52.30.-q |
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Institut 1: |
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Institut für Physik und Astronomie |
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Institut 2: |
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Interdisziplinäres Zentrum Dynamik komplexer Systeme |
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DDC-Sachgruppe: |
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Physik |
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Dokumentart: |
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c Preprint (Vorabdruck) |
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Schriftenreihe: |
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NLD Preprints |
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Bandnummer: |
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paper 025 |
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Sprache: |
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Englisch |
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Erstellungsjahr: |
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1995 |
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Publikationsdatum: |
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08.06.2007 |