Kinematic α effect in the presence of a large-scale motion

Details Kinematic α effect in the presence of a large-scale motion Kinematic α effect in the presence of a large-scale motion

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrve..80d6308c&link_type=abstract

Physical Review E, vol. 80, Issue 4, id. 046308

Physics

3

Turbulent Transport Processes, Plasma Dynamos, Transport Properties, Solar Interior

Scientific paper

We investigate how the addition of a large-scale steady motion, either shear or uniform flow, modifies the magnetic transport properties of a family of chaotic velocity fields with different correlation times. We compute numerically the kinematic α effect that those flows give rise to and show that it is reduced by the presence of a large-scale motion parallel to the large-scale magnetic field, except under certain conditions when it can be slightly enhanced via resonances. The α effect is shown to depend on the nature of the large-scale motion and on the temporal characteristics of the chaotic flow. These results highlight the strong influence that a shear or a uniform flow can have on the turbulent transport of magnetic fields.

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