Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...364..339s&link_type=abstract
Astronomy and Astrophysics, v.364, p.339-347 (2000)
Astronomy and Astrophysics
Astrophysics
22
Magnetic Fields, Turbulence, Sun: Magnetic Fields, Stars: Magnetic Fields
Scientific paper
Using the large-scale or long-time averaged magnetic field diffusion equation, we show that the inhomogeneous distribution of the turbulent helicity fluctuations (more correctly, the fluctuations of the alpha -coefficient) gives rise to the large-scale enhancement of the mean magnetic field. This effect occurs even if the mean helicity is absent. This newly reported dynamo mechanism requires the differential rotation of an atmosphere and does not depend on the action of the Coriolis force. The estimations show that the alpha -coefficients due to helicity fluctuations have the same (or greater) magnitude compared to the usual alpha -coefficients, related to the action of the Coriolis force. However, this mechanism works in the regions of the convective zone where the inhomogeneity of the fluctuation distribution is most prominent. It is very anisotropic in character and is described by the alpha ij-tensor. The possible effect of this mechanism in the Sun is discussed.
No associations
LandOfFree
Magnetic dynamo due to turbulent helicity fluctuations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetic dynamo due to turbulent helicity fluctuations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic dynamo due to turbulent helicity fluctuations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1721920