Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..marj19007b&link_type=abstract
American Physical Society, March Meeting 2004, March 22-26, 2004, Palais des Congres de Montreal, Montreal, Quebec, Canada, MEET
Astronomy and Astrophysics
Astrophysics
Scientific paper
In a turbulent highly conducting fluid, magnetic fields are amplified since the field lines are generally stretched by randomly moving fluid elements in which these lines are frozen. Such a mechanism of turbulent dynamo is expected to work in a variety of astrophysical systems (galaxy clusters, interstellar medium, stars, planets), is confirmed numerically, and is consistent with simple analytical models. Recently, there appeared the number of high-resolution numerical simulations of MHD turbulence with small magnetic Prandtl numbers [Pm=fluid viscosity/fluid resistivity], where magnetic fluctuations were not amplified. This revived old claims that dynamo does not exist in the Kolmogorov turbulence with Pm << 1. However, astrophysical observations show that magnetic fields are generated by turbulent motion rather effectively in planets and stars where magnetic Prandtl numbers are small (e.g., in the geo-dynamo, Pm=10-5, in stars, Pm= 0.01). The talk will address this apparent contradiction. I will argue that dynamo exists for any Pm, if the magnetic Reynolds number is large enough. Ref.: S. Boldyrev & F. Cattaneo, astro-ph/0310780.
No associations
LandOfFree
On magnetic field generation in Kolmogorov turbulence 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 On magnetic field generation in Kolmogorov turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On magnetic field generation in Kolmogorov turbulence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1621757