Scaling laws in decaying helical hydromagnetic turbulence

Details Scaling laws in decaying helical hydromagnetic turbulence Scaling laws in decaying helical hydromagnetic turbulence

2002-09-06

arxiv.org/abs/astro-ph/0209119v2

Astron.Nachr. 326 (2005) 393-399

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures, accepted by Astron Nachr

Scientific paper

10.1002/asna.200510365

We study the evolution of growth and decay laws for the magnetic field coherence length xi, energy E_M and magnetic helicity H in freely decaying 3D MHD turbulence. We show that with certain assumptions, self-similarity of the magnetic power spectrum alone implies that xi~t^{1/2}. This in turn implies that magnetic helicity decays as H~t^{-2s}, where s=(xi_{diff}/xi_H)^2, in terms of xi_{diff}, the diffusion length scale, and xi_H, a length scale defined from the helicity power spectrum. The relative magnetic helicity remains constant, implying that the magnetic energy decays as E_M~t^{-1/2-2s}. The parameter s is inversely proportional to the magnetic Reynolds number Re_M, which is constant in the self-similar regime.

Affiliated with

Also associated with

No associations

Rating

Scaling laws in decaying helical hydromagnetic 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 Scaling laws in decaying helical hydromagnetic turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scaling laws in decaying helical hydromagnetic turbulence will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-669492