Scaling laws in decaying helical hydromagnetic turbulence
| dc.creator | Christensson, Mattias | |
| dc.creator | Hindmarsh, Mark | |
| dc.creator | Brandenburg, Axel | |
| dc.date | 2002-09-06 | |
| dc.date | 2005-06-24 | |
| dc.date.accessioned | 2026-07-07T02:05:00Z | |
| dc.date.available | 2026-07-07T02:05:00Z | |
| dc.description | 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. | |
| dc.description | 7 pages, 3 figures, accepted by Astron Nachr | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0209119 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0209119 | |
| dc.identifier | Astron.Nachr. 326 (2005) 393-399 | |
| dc.identifier | doi:10.1002/asna.200510365 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/4977 | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Chaotic Dynamics | |
| dc.title | Scaling laws in decaying helical hydromagnetic turbulence | |
| dc.type | text |