Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-26
Phys.Rev.E76:056307,2007
Astronomy and Astrophysics
Astrophysics
16 pages, 8 Figures, Physical Review E, in press
Scientific paper
10.1103/PhysRevE.76.056307
Magnetic fluctuations generated by a tangling of the mean magnetic field by velocity fluctuations are studied in a developed turbulent convection with large magnetic Reynolds numbers. We show that the energy of magnetic fluctuations depends on magnetic Reynolds number only when the mean magnetic field is smaller than $B_{eq} / 4 Rm^{1/4}$, where $B_{eq}$ is the equipartition mean magnetic field determined by the turbulent kinetic energy and Rm is magnetic Reynolds number. Generation of magnetic fluctuations in a turbulent convection with a nonzero mean magnetic field results in a decrease of the total turbulent pressure and may cause formation of the large-scale inhomogeneous magnetic structures even in an originally uniform mean magnetic field. This effect is caused by a negative contribution of the turbulent convection to the effective mean Lorentz force. The inhomogeneous large-scale magnetic fields are formed due to the excitation of the large-scale instability. The energy for this instability is supplied by the small-scale turbulent convection. The discussed effects might be useful for understanding the origin of the solar nonuniform magnetic fields, e.g., sunspots.
Kleeorin Nathan
Rogachevskii Igor
No associations
LandOfFree
Magnetic fluctuations and formation of large-scale inhomogeneous magnetic structures in a turbulent convection 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 fluctuations and formation of large-scale inhomogeneous magnetic structures in a turbulent convection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic fluctuations and formation of large-scale inhomogeneous magnetic structures in a turbulent convection will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-191598